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allhaileris
2026-02-16 15:50:16 +03:00
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34
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ColumnLimit: 100
UseTab: Never
IndentWidth: 4
AccessModifierOffset: -4
NamespaceIndentation: Inner
BreakBeforeBraces: Custom
BraceWrapping:
AfterNamespace: true
AfterEnum: true
AfterStruct: true
AfterClass: true
SplitEmptyFunction: false
AfterControlStatement: true
AfterFunction: true
AfterUnion: true
BeforeElse: true
AlwaysBreakTemplateDeclarations: true
BreakConstructorInitializersBeforeComma: true
ConstructorInitializerAllOnOneLineOrOnePerLine: true
AllowShortBlocksOnASingleLine: true
AllowShortFunctionsOnASingleLine: All
AllowShortIfStatementsOnASingleLine: true
AllowShortLoopsOnASingleLine: true
PointerAlignment: Left
AlignConsecutiveAssignments: false
AlignTrailingComments: true
SpaceAfterCStyleCast: true
CommentPragmas: '^ NO-FORMAT:'

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include/gsl/* linguist-language=C++

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name: CI_Android
concurrency:
group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
cancel-in-progress: true
on:
push:
branches: [ main ]
pull_request:
branches: [ main ]
jobs:
Android:
runs-on: macos-latest-large
defaults:
run:
working-directory: build
steps:
- uses: actions/checkout@v4
- name: Create build directory
run: mkdir -p build
working-directory: .
- uses: actions/setup-java@v4
with:
java-version: 8
distribution: zulu
- name: Start Emulator
run: |
echo "y" | $ANDROID_HOME/tools/bin/sdkmanager --install 'system-images;android-24;default;x86_64'
echo "no" | $ANDROID_HOME/tools/bin/avdmanager create avd -n xamarin_android_emulator -k 'system-images;android-24;default;x86_64' --force
$ANDROID_HOME/emulator/emulator -list-avds
echo "Starting emulator..."
nohup $ANDROID_HOME/emulator/emulator -no-audio -no-snapshot -avd xamarin_android_emulator &> /dev/null &
echo "Emulator starting in background"
- name: Configure
run: cmake -Werror=dev -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_LATEST_HOME/build/cmake/android.toolchain.cmake -DANDROID_PLATFORM=16 -DANDROID_ABI=x86_64 -DCMAKE_BUILD_TYPE=Debug ..
- name: Build
run: cmake --build . --parallel
- name: Wait for emulator ready
timeout-minutes: 2
run: |
$ANDROID_HOME/platform-tools/adb wait-for-device shell 'while [[ -z $(getprop sys.boot_completed | tr -d '\r') ]]; do sleep 10; done; input keyevent 82'
$ANDROID_HOME/platform-tools/adb devices
$ANDROID_HOME/platform-tools/adb shell getprop ro.product.cpu.abi
- name: Deploy tests
run: |
adb push tests /data/local/tmp
adb shell find /data/local/tmp/tests -maxdepth 1 -exec chmod +x {} \\\;
- name: Test
run: adb shell find /data/local/tmp/tests -name "*_tests" -maxdepth 1 -exec {} \\\;

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name: Composite CMake
inputs:
cmake_generator:
required: false
type: string
default: 'Unix Makefiles'
cmake_build_type:
required: true
type: string
default: ''
cmake_cxx_compiler:
required: false
type: string
gsl_cxx_standard:
required: true
type: number
extra_cmake_args:
required: false
type: string
default: ''
build_cmd:
required: true
type: string
default: 'make'
test_cmd:
required: false
type: string
default: 'make test'
shell:
required: false
type: string
default: 'bash'
runs:
using: composite
steps:
- name: Create build directory
run: mkdir build
shell: ${{ inputs.shell }}
- name: Configure CMake
working-directory: build
run: cmake -G "${{ inputs.cmake_generator }}" -DCMAKE_BUILD_TYPE=${{ inputs.cmake_build_type }} -DCMAKE_CXX_COMPILER=${{ inputs.cmake_cxx_compiler }} -DGSL_CXX_STANDARD=${{ inputs.gsl_cxx_standard }} -DCI_TESTING:BOOL=ON -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -Werror=dev ${{ inputs.extra_cmake_args }} ..
shell: ${{ inputs.shell }}
- name: Build
working-directory: build
run: ${{ inputs.build_cmd }}
shell: ${{ inputs.shell }}
- name: Test
working-directory: build
run: ${{ inputs.test_cmd }}
shell: ${{ inputs.shell }}

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name: cmake_find_package
on:
push:
branches: [ main ]
pull_request:
branches: [ main ]
jobs:
cmake-find-package:
name: Build ${{ matrix.os }}
runs-on: ${{ matrix.os }}
strategy:
matrix:
os: [ ubuntu-latest, macos-latest ]
steps:
- uses: actions/checkout@v4
- uses: lukka/get-cmake@latest
with:
cmakeVersion: 3.14.0
- name: Configure GSL
run: cmake -S . -B build -G "Ninja" -D GSL_TEST=OFF -D CMAKE_INSTALL_PREFIX=${GITHUB_WORKSPACE}/build/install
- name: Install GSL
run: cmake --build build --target install
- name: Test GSL find_package support
run: cmake -S tests/ -B build/tests_find_package -G "Ninja" -D CMAKE_PREFIX_PATH=${GITHUB_WORKSPACE}/build/install -D CMAKE_BUILD_TYPE=Release

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name: Compiler Integration Tests
concurrency:
group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
cancel-in-progress: true
on:
push:
branches: [ main ]
pull_request:
branches: [ main ]
# These jobs are correlated with the officially supported compilers
# and toolsets. If you change any versions, please update README.md.
jobs:
gcc:
strategy:
matrix:
gcc_version: [ 10, 11, 12 ]
build_type: [ Debug, Release ]
cxx_version: [ 14, 17, 20, 23 ]
exclude:
- gcc_version: 10
cxx_version: 23
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Run CMake (configure, build, test)
uses: ./.github/workflows/cmake
with:
cmake_build_type: ${{ matrix.build_type }}
cmake_cxx_compiler: g++-${{ matrix.gcc_version }}
gsl_cxx_standard: ${{ matrix.cxx_version }}
clang:
strategy:
matrix:
clang_version: [ 13, 14, 15 ]
build_type: [ Debug, Release ]
cxx_version: [ 14, 17, 20, 23 ]
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Run CMake (configure, build, test)
uses: ./.github/workflows/cmake
with:
cmake_build_type: ${{ matrix.build_type }}
cmake_cxx_compiler: clang++-${{ matrix.clang_version }}
gsl_cxx_standard: ${{ matrix.cxx_version }}
xcode:
strategy:
matrix:
xcode_version: [ '14.3.1', '15.4' ]
build_type: [ Debug, Release ]
cxx_version: [ 14, 17, 20, 23 ]
runs-on: macos-latest
steps:
- uses: actions/checkout@v4
- name: select xcode version
run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode_version }}.app
- name: Run CMake (configure, build, test)
uses: ./.github/workflows/cmake
with:
cmake_build_type: ${{ matrix.build_type }}
cmake_cxx_compiler: clang++
gsl_cxx_standard: ${{ matrix.cxx_version }}
VisualStudio:
strategy:
matrix:
generator: [ 'Visual Studio 16 2019', 'Visual Studio 17 2022' ]
image: [ windows-2019, windows-2022 ]
build_type: [ Debug, Release ]
extra_args: [ '', '-T ClangCL' ]
cxx_version: [ 14, 17, 20, 23 ]
exclude:
- generator: 'Visual Studio 17 2022'
image: windows-2019
- generator: 'Visual Studio 16 2019'
image: windows-2022
- generator: 'Visual Studio 16 2019'
cxx_version: 23
runs-on: ${{ matrix.image }}
steps:
- uses: actions/checkout@v4
- uses: microsoft/setup-msbuild@v2
- name: Run CMake (configure, build, test)
uses: ./.github/workflows/cmake
with:
cmake_generator: ${{ matrix.generator }}
cmake_build_type: ${{ matrix.build_type }}
gsl_cxx_standard: ${{ matrix.cxx_version }}
extra_cmake_args: ${{ matrix.extra_args }}
build_cmd: msbuild GSL.sln
test_cmd: ctest . --output-on-failure --no-compress-output
shell: pwsh

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name: CI_iOS
on:
push:
branches: [ main ]
pull_request:
branches: [ main ]
jobs:
iOS:
runs-on: macos-latest
defaults:
run:
working-directory: build
steps:
- uses: actions/checkout@v4
- name: Create build directory
run: mkdir -p build
working-directory: .
- name: Configure
run: |
cmake \
-Werror=dev \
-GXcode \
-DCMAKE_SYSTEM_NAME=iOS \
"-DCMAKE_OSX_ARCHITECTURES=arm64;x86_64" \
-DCMAKE_OSX_DEPLOYMENT_TARGET=9 \
-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY \
"-DMACOSX_BUNDLE_GUI_IDENTIFIER=GSL.\$(EXECUTABLE_NAME)" \
-DMACOSX_BUNDLE_BUNDLE_VERSION=3.1.0 \
-DMACOSX_BUNDLE_SHORT_VERSION_STRING=3.1.0 \
..
- name: Build
run: cmake --build . --parallel `sysctl -n hw.ncpu` --config Release -- -sdk iphonesimulator
- name: Start simulator
run: |
RUNTIME=`xcrun simctl list runtimes iOS -j|jq '.runtimes|last.identifier'`
UDID=`xcrun simctl list devices iPhone available -j|jq -r ".devices[$RUNTIME]|last.udid"`
xcrun simctl bootstatus $UDID -b
- name: Test
run: |
for TEST in `find tests/Release-iphonesimulator -depth 1 -name "*.app"`
do
xcrun simctl install booted $TEST
TEST_ID=`plutil -convert json -o - $TEST/Info.plist|jq -r ".CFBundleIdentifier"`
xcrun simctl launch --console booted $TEST_ID
xcrun simctl uninstall booted $TEST_ID
done

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CMakeFiles
build
tests/CMakeFiles
tests/Debug
*.opensdf
*.sdf
tests/*tests.dir
*.vcxproj
*.vcxproj.filters
*.sln
*.tlog
Testing/Temporary/*.*
CMakeCache.txt
*.suo
.vs/
.vscode/

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cmake_minimum_required(VERSION 3.14...3.16)
project(GSL VERSION 4.1.0 LANGUAGES CXX)
add_library(GSL INTERFACE)
add_library(Microsoft.GSL::GSL ALIAS GSL)
# https://cmake.org/cmake/help/latest/variable/PROJECT_IS_TOP_LEVEL.html
string(COMPARE EQUAL ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_SOURCE_DIR} PROJECT_IS_TOP_LEVEL)
option(GSL_INSTALL "Generate and install GSL target" ${PROJECT_IS_TOP_LEVEL})
option(GSL_TEST "Build and perform GSL tests" ${PROJECT_IS_TOP_LEVEL})
# The implementation generally assumes a platform that implements C++14 support
target_compile_features(GSL INTERFACE "cxx_std_14")
# Setup include directory
add_subdirectory(include)
target_sources(GSL INTERFACE $<BUILD_INTERFACE:${GSL_SOURCE_DIR}/GSL.natvis>)
if (GSL_TEST)
enable_testing()
add_subdirectory(tests)
endif()
if (GSL_INSTALL)
include(GNUInstallDirs)
include(CMakePackageConfigHelpers)
install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/gsl" DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
set(export_name "Microsoft.GSLConfig")
set(namespace "Microsoft.GSL::")
set(cmake_files_install_dir ${CMAKE_INSTALL_DATADIR}/cmake/Microsoft.GSL)
install(TARGETS GSL EXPORT ${export_name} INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
install(EXPORT ${export_name} NAMESPACE ${namespace} DESTINATION ${cmake_files_install_dir})
export(TARGETS GSL NAMESPACE ${namespace} FILE ${export_name}.cmake)
set(gls_config_version "${CMAKE_CURRENT_BINARY_DIR}/Microsoft.GSLConfigVersion.cmake")
write_basic_package_version_file(${gls_config_version} COMPATIBILITY SameMajorVersion ARCH_INDEPENDENT)
install(FILES ${gls_config_version} DESTINATION ${cmake_files_install_dir})
install(FILES GSL.natvis DESTINATION ${cmake_files_install_dir})
endif()

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{
"configurations": [
{
"name": "x64-Debug",
"generator": "Ninja",
"configurationType": "Debug",
"inheritEnvironments": [
"msvc_x64_x64"
],
"buildRoot": "${env.USERPROFILE}\\CMakeBuilds\\${workspaceHash}\\build\\${name}",
"installRoot": "${env.USERPROFILE}\\CMakeBuilds\\${workspaceHash}\\install\\${name}",
"cmakeCommandArgs": "-DGSL_CXX_STANDARD=17",
"buildCommandArgs": "-v",
"ctestCommandArgs": "",
"codeAnalysisRuleset": "CppCoreCheckRules.ruleset"
}
]
}

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## Contributing to the Guidelines Support Library
The Guidelines Support Library (GSL) contains functions and types that are suggested for use by the
[C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines). GSL design changes are made only as a result of modifications to the Guidelines.
GSL is accepting contributions that improve or refine any of the types in this library as well as ports to other platforms. Changes should have an issue
tracking the suggestion that has been approved by the maintainers. Your pull request should include a link to the bug that you are fixing. If you've submitted
a PR, please post a comment in the associated issue to avoid duplication of effort.
## Legal
You will need to complete a Contributor License Agreement (CLA). Briefly, this agreement testifies that you are granting us and the community permission to
use the submitted change according to the terms of the project's license, and that the work being submitted is under appropriate copyright.
Please submit a Contributor License Agreement (CLA) before submitting a pull request. You may visit https://cla.microsoft.com to sign digitally.
## Housekeeping
Your pull request should:
* Include a description of what your change intends to do
* Be a child commit of a reasonably recent commit in the **main** branch
* Requests need not be a single commit, but should be a linear sequence of commits (i.e. no merge commits in your PR)
* It is desirable, but not necessary, for the tests to pass at each commit. Please see [README.md](./README.md) for instructions to build the test suite.
* Have clear commit messages
* e.g. "Fix issue", "Add tests for type", etc.
* Include appropriate tests
* Tests should include reasonable permutations of the target fix/change
* Include baseline changes with your change
* All changed code must have 100% code coverage
* To avoid line ending issues, set `autocrlf = input` and `whitespace = cr-at-eol` in your git configuration

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<?xml version="1.0" encoding="utf-8"?>
<!--
This will make GitHub and some editors recognize this code as XML:
vim: syntax=xml
-->
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
<!-- These types are from the util header. -->
<Type Name="gsl::final_action&lt;*&gt;">
<DisplayString>{{ invoke = {invoke_}, action = {f_} }}</DisplayString>
<Expand>
<Item Name="[invoke]">invoke_</Item>
<Item Name="[callback]">f_</Item>
</Expand>
</Type>
<!-- These types are from the span header. -->
<Type Name="gsl::span&lt;*, *&gt;">
<DisplayString>{{ extent = {storage_.size_} }}</DisplayString>
<Expand>
<ArrayItems>
<Size>storage_.size_</Size>
<ValuePointer>storage_.data_</ValuePointer>
</ArrayItems>
</Expand>
</Type>
<!-- These types are from the pointers header. -->
<Type Name="gsl::not_null&lt;*&gt;">
<!-- We can always dereference this since it's an invariant. -->
<DisplayString>value = {*ptr_}</DisplayString>
</Type>
</AutoVisualizer>

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Copyright (c) 2015 Microsoft Corporation. All rights reserved.
This code is licensed under the MIT License (MIT).
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# GSL: Guidelines Support Library
[![Build Status](https://dev.azure.com/cppstat/GSL/_apis/build/status/microsoft.GSL?branchName=main)](https://dev.azure.com/cppstat/GSL/_build/latest?definitionId=1&branchName=main)
The Guidelines Support Library (GSL) contains functions and types that are suggested for use by the
[C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines) maintained by the [Standard C++ Foundation](https://isocpp.org).
This repo contains Microsoft's implementation of GSL.
The entire implementation is provided inline in the headers under the [gsl](./include/gsl) directory. The implementation generally assumes a platform that implements C++14 support.
While some types have been broken out into their own headers (e.g. [gsl/span](./include/gsl/span)),
it is simplest to just include [gsl/gsl](./include/gsl/gsl) and gain access to the entire library.
> NOTE: We encourage contributions that improve or refine any of the types in this library as well as ports to
other platforms. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more information about contributing.
# Project Code of Conduct
This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
# Usage of Third Party Libraries
This project makes use of the [Google Test](https://github.com/google/googletest) testing library. Please see the [ThirdPartyNotices.txt](./ThirdPartyNotices.txt) file for details regarding the licensing of Google Test.
# Supported features
## Microsoft GSL implements the following from the C++ Core Guidelines:
Feature | Supported? | Description
-------------------------------------------------------------------------|:----------:|-------------
[**1. Views**][cg-views] | |
[owner](docs/headers.md#user-content-H-pointers-owner) | &#x2611; | An alias for a raw pointer
[not_null](docs/headers.md#user-content-H-pointers-not_null) | &#x2611; | Restricts a pointer/smart pointer to hold non-null values
[span](docs/headers.md#user-content-H-span-span) | &#x2611; | A view over a contiguous sequence of memory. Based on the standardized version of `std::span`, however `gsl::span` enforces bounds checking.
span_p | &#x2610; | Spans a range starting from a pointer to the first place for which the predicate is true
[basic_zstring](docs/headers.md#user-content-H-zstring) | &#x2611; | A pointer to a C-string (zero-terminated array) with a templated char type
[zstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `char`
[czstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `const char`
[wzstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `wchar_t`
[cwzstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `const wchar_t`
[u16zstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `char16_t`
[cu16zstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `const char16_t`
[u32zstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `char32_t`
[cu32zstring](docs/headers.md#user-content-H-zstring) | &#x2611; | An alias to `basic_zstring` with dynamic extent and a char type of `const char32_t`
[**2. Owners**][cg-owners] | |
[unique_ptr](docs/headers.md#user-content-H-pointers-unique_ptr) | &#x2611; | An alias to `std::unique_ptr`
[shared_ptr](docs/headers.md#user-content-H-pointers-shared_ptr) | &#x2611; | An alias to `std::shared_ptr`
stack_array | &#x2610; | A stack-allocated array
dyn_array | &#x2610; | A heap-allocated array
[**3. Assertions**][cg-assertions] | |
[Expects](docs/headers.md#user-content-H-assert-expects) | &#x2611; | A precondition assertion; on failure it terminates
[Ensures](docs/headers.md#user-content-H-assert-ensures) | &#x2611; | A postcondition assertion; on failure it terminates
[**4. Utilities**][cg-utilities] | |
move_owner | &#x2610; | A helper function that moves one `owner` to the other
[byte](docs/headers.md#user-content-H-byte-byte) | &#x2611; | Either an alias to `std::byte` or a byte type
[final_action](docs/headers.md#user-content-H-util-final_action) | &#x2611; | A RAII style class that invokes a functor on its destruction
[finally](docs/headers.md#user-content-H-util-finally) | &#x2611; | A helper function instantiating [final_action](docs/headers.md#user-content-H-util-final_action)
[GSL_SUPPRESS](docs/headers.md#user-content-H-assert-gsl_suppress) | &#x2611; | A macro that takes an argument and turns it into `[[gsl::suppress(x)]]` or `[[gsl::suppress("x")]]`
[[implicit]] | &#x2610; | A "marker" to put on single-argument constructors to explicitly make them non-explicit
[index](docs/headers.md#user-content-H-util-index) | &#x2611; | A type to use for all container and array indexing (currently an alias for `std::ptrdiff_t`)
joining_thread | &#x2610; | A RAII style version of `std::thread` that joins
[narrow](docs/headers.md#user-content-H-narrow-narrow) | &#x2611; | A checked version of `narrow_cast`; it can throw [narrowing_error](docs/headers.md#user-content-H-narrow-narrowing_error)
[narrow_cast](docs/headers.md#user-content-H-util-narrow_cast) | &#x2611; | A narrowing cast for values and a synonym for `static_cast`
[narrowing_error](docs/headers.md#user-content-H-narrow-narrowing_error) | &#x2611; | A custom exception type thrown by [narrow](docs/headers.md#user-content-H-narrow-narrow)
[**5. Concepts**][cg-concepts] | &#x2610; |
## The following features do not exist in or have been removed from the C++ Core Guidelines:
Feature | Supported? | Description
-----------------------------------|:----------:|-------------
[strict_not_null](docs/headers.md#user-content-H-pointers-strict_not_null) | &#x2611; | A stricter version of [not_null](docs/headers.md#user-content-H-pointers-not_null) with explicit constructors
multi_span | &#x2610; | Deprecated. Multi-dimensional span.
strided_span | &#x2610; | Deprecated. Support for this type has been discontinued.
basic_string_span | &#x2610; | Deprecated. Like `span` but for strings with a templated char type
string_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `char`
cstring_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `const char`
wstring_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `wchar_t`
cwstring_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `const wchar_t`
u16string_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `char16_t`
cu16string_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `const char16_t`
u32string_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `char32_t`
cu32string_span | &#x2610; | Deprecated. An alias to `basic_string_span` with a char type of `const char32_t`
This is based on [CppCoreGuidelines semi-specification](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gsl-guidelines-support-library).
[cg-views]: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gslview-views
[cg-owners]: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gslowner-ownership-pointers
[cg-assertions]: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gslassert-assertions
[cg-utilities]: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gslutil-utilities
[cg-concepts]: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gslconcept-concepts
# Quick Start
## Supported Compilers / Toolsets
The GSL officially supports recent major versions of Visual Studio with both MSVC and LLVM, GCC, Clang, and XCode with Apple-Clang.
For each of these major versions, the GSL officially supports C++14, C++17, C++20, and C++23 (when supported by the compiler).
Below is a table showing the versions currently being tested (also see [.github/workflows/compilers.yml](the workflow).)
Compiler |Toolset Versions Currently Tested
:------- |--:
GCC | 10, 11, 12
XCode | 14.3.1, 15.4
Clang | 13, 14, 15
Visual Studio with MSVC | VS2019, VS2022
Visual Studio with LLVM | VS2019, VS2022
---
If you successfully port GSL to another platform, we would love to hear from you!
- Submit an issue specifying the platform and target.
- Consider contributing your changes by filing a pull request with any necessary changes.
- If at all possible, add a CI/CD step and add the button to the table below!
Target | CI/CD Status
:------- | -----------:
iOS | ![CI_iOS](https://github.com/microsoft/GSL/workflows/CI_iOS/badge.svg)
Android | ![CI_Android](https://github.com/microsoft/GSL/workflows/CI_Android/badge.svg)
Note: These CI/CD steps are run with each pull request, however failures in them are non-blocking.
## Building the tests
To build the tests, you will require the following:
* [CMake](http://cmake.org), version 3.14 or later to be installed and in your PATH.
These steps assume the source code of this repository has been cloned into a directory named `c:\GSL`.
1. Create a directory to contain the build outputs for a particular architecture (we name it `c:\GSL\build-x86` in this example).
cd GSL
md build-x86
cd build-x86
2. Configure CMake to use the compiler of your choice (you can see a list by running `cmake --help`).
cmake -G "Visual Studio 15 2017" c:\GSL
3. Build the test suite (in this case, in the Debug configuration, Release is another good choice).
cmake --build . --config Debug
4. Run the test suite.
ctest -C Debug
All tests should pass - indicating your platform is fully supported and you are ready to use the GSL types!
## Building GSL - Using vcpkg
You can download and install GSL using the [vcpkg](https://github.com/Microsoft/vcpkg) dependency manager:
git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
vcpkg install ms-gsl
The GSL port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
## Using the libraries
As the types are entirely implemented inline in headers, there are no linking requirements.
You can copy the [gsl](./include/gsl) directory into your source tree so it is available
to your compiler, then include the appropriate headers in your program.
Alternatively set your compiler's *include path* flag to point to the GSL development folder (`c:\GSL\include` in the example above) or installation folder (after running the install). Eg.
MSVC++
/I c:\GSL\include
GCC/clang
-I$HOME/dev/GSL/include
Include the library using:
#include <gsl/gsl>
## Usage in CMake
The library provides a Config file for CMake, once installed it can be found via `find_package`.
Which, when successful, will add library target called `Microsoft.GSL::GSL` which you can use via the usual
`target_link_libraries` mechanism.
```cmake
find_package(Microsoft.GSL CONFIG REQUIRED)
target_link_libraries(foobar PRIVATE Microsoft.GSL::GSL)
```
### FetchContent
If you are using CMake version 3.11+ you can use the official [FetchContent module](https://cmake.org/cmake/help/latest/module/FetchContent.html).
This allows you to easily incorporate GSL into your project.
```cmake
# NOTE: This example uses CMake version 3.14 (FetchContent_MakeAvailable).
# Since it streamlines the FetchContent process
cmake_minimum_required(VERSION 3.14)
include(FetchContent)
FetchContent_Declare(GSL
GIT_REPOSITORY "https://github.com/microsoft/GSL"
GIT_TAG "v4.1.0"
GIT_SHALLOW ON
)
FetchContent_MakeAvailable(GSL)
target_link_libraries(foobar PRIVATE Microsoft.GSL::GSL)
```
## Debugging visualization support
For Visual Studio users, the file [GSL.natvis](./GSL.natvis) in the root directory of the repository can be added to your project if you would like more helpful visualization of GSL types in the Visual Studio debugger than would be offered by default.
## See Also
For information on [Microsoft Gray Systems Lab (GSL)](https://aka.ms/gsl) of applied data management and system research see <https://aka.ms/gsl>.

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<!-- BEGIN MICROSOFT SECURITY.MD V0.0.7 BLOCK -->
## Security
Microsoft takes the security of our software products and services seriously, which includes all source code repositories managed through our GitHub organizations, which include [Microsoft](https://github.com/Microsoft), [Azure](https://github.com/Azure), [DotNet](https://github.com/dotnet), [AspNet](https://github.com/aspnet), [Xamarin](https://github.com/xamarin), and [our GitHub organizations](https://opensource.microsoft.com/).
If you believe you have found a security vulnerability in any Microsoft-owned repository that meets [Microsoft's definition of a security vulnerability](https://aka.ms/opensource/security/definition), please report it to us as described below.
## Reporting Security Issues
**Please do not report security vulnerabilities through public GitHub issues.**
Instead, please report them to the Microsoft Security Response Center (MSRC) at [https://msrc.microsoft.com/create-report](https://aka.ms/opensource/security/create-report).
If you prefer to submit without logging in, send email to [secure@microsoft.com](mailto:secure@microsoft.com). If possible, encrypt your message with our PGP key; please download it from the [Microsoft Security Response Center PGP Key page](https://aka.ms/opensource/security/pgpkey).
You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Additional information can be found at [microsoft.com/msrc](https://aka.ms/opensource/security/msrc).
Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
* Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
* Full paths of source file(s) related to the manifestation of the issue
* The location of the affected source code (tag/branch/commit or direct URL)
* Any special configuration required to reproduce the issue
* Step-by-step instructions to reproduce the issue
* Proof-of-concept or exploit code (if possible)
* Impact of the issue, including how an attacker might exploit the issue
This information will help us triage your report more quickly.
If you are reporting for a bug bounty, more complete reports can contribute to a higher bounty award. Please visit our [Microsoft Bug Bounty Program](https://aka.ms/opensource/security/bounty) page for more details about our active programs.
## Preferred Languages
We prefer all communications to be in English.
## Policy
Microsoft follows the principle of [Coordinated Vulnerability Disclosure](https://aka.ms/opensource/security/cvd).
<!-- END MICROSOFT SECURITY.MD BLOCK -->

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THIRD-PARTY SOFTWARE NOTICES AND INFORMATION
Do Not Translate or Localize
GSL: Guidelines Support Library incorporates third party material from the projects listed below.
-------------------------------------------------------------------------------
Software: Google Test
Owner: Google Inc.
Source URL: github.com/google/googletest
License: BSD 3 - Clause
Text:
Copyright 2008, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-------------------------------------------------------------------------------

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The Guidelines Support Library (GSL) interface is very lightweight and exposed via a header-only library. This document attempts to document all of the headers and their exposed classes and functions.
Types and functions are exported in the namespace `gsl`.
See [GSL: Guidelines support library](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#S-gsl)
# <a name="H" />Headers
- [`<algorithms>`](#user-content-H-algorithms)
- [`<assert>`](#user-content-H-assert)
- [`<byte>`](#user-content-H-byte)
- [`<gsl>`](#user-content-H-gsl)
- [`<narrow>`](#user-content-H-narrow)
- [`<pointers>`](#user-content-H-pointers)
- [`<span>`](#user-content-H-span)
- [`<span_ext>`](#user-content-H-span_ext)
- [`<zstring>`](#user-content-H-zstring)
- [`<util>`](#user-content-H-util)
## <a name="H-algorithms" />`<algorithms>`
This header contains some common algorithms that have been wrapped in GSL safety features.
- [`gsl::copy`](#user-content-H-algorithms-copy)
### <a name="H-algorithms-copy" />`gsl::copy`
```cpp
template <class SrcElementType, std::size_t SrcExtent, class DestElementType,
std::size_t DestExtent>
void copy(span<SrcElementType, SrcExtent> src, span<DestElementType, DestExtent> dest);
```
This function copies the content from the `src` [`span`](#user-content-H-span-span) to the `dest` [`span`](#user-content-H-span-span). It [`Expects`](#user-content-H-assert-expects)
that the destination `span` is at least as large as the source `span`.
## <a name="H-assert" />`<assert>`
This header contains some macros used for contract checking and suppressing code analysis warnings.
See [GSL.assert: Assertions](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-assertions)
- [`GSL_SUPPRESS`](#user-content-H-assert-gsl_suppress)
- [`Expects`](#user-content-H-assert-expects)
- [`Ensures`](#user-content-H-assert-ensures)
### <a name="H-assert-gsl_suppress" />`GSL_SUPPRESS`
This macro can be used to suppress a code analysis warning.
The core guidelines request tools that check for the rules to respect suppressing a rule by writing
`[[gsl::suppress(tag)]]` or `[[gsl::suppress(tag, justification: "message")]]`.
Clang does not use exactly that syntax, but requires `tag` to be put in double quotes `[[gsl::suppress("tag")]]`.
For portable code you can use `GSL_SUPPRESS(tag)`.
See [In.force: Enforcement](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#inforce-enforcement).
### <a name="H-assert-expects" />`Expects`
This macro can be used for expressing a precondition. If the precondition is not held, then `std::terminate` will be called.
See [I.6: Prefer `Expects()` for expressing preconditions](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#i6-prefer-expects-for-expressing-preconditions)
### <a name="H-assert-ensures" />`Ensures`
This macro can be used for expressing a postcondition. If the postcondition is not held, then `std::terminate` will be called.
See [I.8: Prefer `Ensures()` for expressing postconditions](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#i8-prefer-ensures-for-expressing-postconditions)
## <a name="H-byte" />`<byte>`
This header contains the definition of a byte type, implementing `std::byte` before it was standardized into C++17.
- [`gsl::byte`](#user-content-H-byte-byte)
### <a name="H-byte-byte" />`gsl::byte`
If `GSL_USE_STD_BYTE` is defined to be `1`, then `gsl::byte` will be an alias to `std::byte`.
If `GSL_USE_STD_BYTE` is defined to be `0`, then `gsl::byte` will be a distinct type that implements the concept of byte.
If `GSL_USE_STD_BYTE` is not defined, then the header file will check if `std::byte` is available (C\+\+17 or higher). If yes,
`gsl::byte` will be an alias to `std::byte`, otherwise `gsl::byte` will be a distinct type that implements the concept of byte.
&#x26a0; Take care when linking projects that were compiled with different language standards (before C\+\+17 and C\+\+17 or higher).
If you do so, you might want to `#define GSL_USE_STD_BYTE 0` to a fixed value to be sure that both projects use exactly
the same type. Otherwise you might get linker errors.
See [SL.str.5: Use `std::byte` to refer to byte values that do not necessarily represent characters](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rstr-byte)
### Non-member functions
```cpp
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte& operator<<=(byte& b, IntegerType shift) noexcept;
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte operator<<(byte b, IntegerType shift) noexcept;
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept;
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte operator>>(byte b, IntegerType shift) noexcept;
```
Left or right shift a `byte` by a given number of bits.
```cpp
constexpr byte& operator|=(byte& l, byte r) noexcept;
constexpr byte operator|(byte l, byte r) noexcept;
```
Bitwise "or" of two `byte`s.
```cpp
constexpr byte& operator&=(byte& l, byte r) noexcept;
constexpr byte operator&(byte l, byte r) noexcept;
```
Bitwise "and" of two `byte`s.
```cpp
constexpr byte& operator^=(byte& l, byte r) noexcept;
constexpr byte operator^(byte l, byte r) noexcept;
```
Bitwise xor of two `byte`s.
```cpp
constexpr byte operator~(byte b) noexcept;
```
Bitwise negation of a `byte`. Flips all bits. Zeroes become ones, ones become zeroes.
```cpp
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr IntegerType to_integer(byte b) noexcept;
```
Convert the given `byte` value to an integral type.
```cpp
template <typename T>
constexpr byte to_byte(T t) noexcept;
```
Convert the given value to a `byte`. The template requires `T` to be an `unsigned char` so that no data loss can occur.
If you want to convert an integer constant to a `byte` you probably want to call `to_byte<integer constant>()`.
```cpp
template <int I>
constexpr byte to_byte() noexcept;
```
Convert the given value `I` to a `byte`. The template requires `I` to be in the valid range 0..255 for a `gsl::byte`.
## <a name="H-gsl" />`<gsl>`
This header is a convenience header that includes all other [GSL headers](#user-content-H).
Since `<narrow>` requires exceptions, it will only be included if exceptions are enabled.
## <a name="H-narrow" />`<narrow>`
This header contains utility functions and classes, for narrowing casts, which require exceptions. The narrowing-related utilities that don't require exceptions are found inside [util](#user-content-H-util).
See [GSL.util: Utilities](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-utilities)
- [`gsl::narrowing_error`](#user-content-H-narrow-narrowing_error)
- [`gsl::narrow`](#user-content-H-narrow-narrow)
### <a name="H-narrow-narrowing_error" />`gsl::narrowing_error`
`gsl::narrowing_error` is the exception thrown by [`gsl::narrow`](#user-content-H-narrow-narrow) when a narrowing conversion fails. It is derived from `std::exception`.
### <a name="H-narrow-narrow" />`gsl::narrow`
`gsl::narrow<T>(x)` is a named cast that does a `static_cast<T>(x)` for narrowing conversions with no signedness promotions.
If the argument `x` cannot be represented in the target type `T`, then the function throws a [`gsl::narrowing_error`](#user-content-H-narrow-narrowing_error) (e.g., `narrow<unsigned>(-42)` and `narrow<char>(300)` throw).
Note: compare [`gsl::narrow_cast`](#user-content-H-util-narrow_cast) in header [util](#user-content-H-util).
See [ES.46: Avoid lossy (narrowing, truncating) arithmetic conversions](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Res-narrowing) and [ES.49: If you must use a cast, use a named cast](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Res-casts-named)
## <a name="H-pointers" />`<pointers>`
This header contains some pointer types.
See [GSL.view](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-views)
- [`gsl::unique_ptr`](#user-content-H-pointers-unique_ptr)
- [`gsl::shared_ptr`](#user-content-H-pointers-shared_ptr)
- [`gsl::owner`](#user-content-H-pointers-owner)
- [`gsl::not_null`](#user-content-H-pointers-not_null)
- [`gsl::strict_not_null`](#user-content-H-pointers-strict_not_null)
### <a name="H-pointers-unique_ptr" />`gsl::unique_ptr`
`gsl::unique_ptr` is an alias to `std::unique_ptr`.
See [GSL.owner: Ownership pointers](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-ownership)
### <a name="H-pointers-shared_ptr" />`gsl::shared_ptr`
`gsl::shared_ptr` is an alias to `std::shared_ptr`.
See [GSL.owner: Ownership pointers](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-ownership)
### <a name="H-pointers-owner" />`gsl::owner`
`gsl::owner<T>` is designed as a safety mechanism for code that must deal directly with raw pointers that own memory. Ideally such code should be restricted to the implementation of low-level abstractions. `gsl::owner` can also be used as a stepping point in converting legacy code to use more modern RAII constructs such as smart pointers.
`T` must be a pointer type (`std::is_pointer<T>`).
A `gsl::owner<T>` is a typedef to `T`. It adds no runtime overhead whatsoever, as it is purely syntactic and does not add any runtime checks. Instead, it serves as an annotation for static analysis tools which check for memory safety, and as a code comprehension guide for human readers.
See Enforcement section of [C.31: All resources acquired by a class must be released by the class’s destructor](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-dtor-release).
### <a name="H-pointers-not_null" />`gsl::not_null`
`gsl::not_null<T>` restricts a pointer or smart pointer to only hold non-null values. It has no size overhead over `T`.
The checks for ensuring that the pointer is not null are done in the constructor. There is no overhead when retrieving or dereferencing the checked pointer.
When a nullptr check fails, `std::terminate` is called.
See [F.23: Use a `not_null<T>` to indicate that “null” is not a valid value](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rf-nullptr)
#### Member functions
##### Construct/Copy
```cpp
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr not_null(U&& u);
template <typename = std::enable_if_t<!std::is_same<std::nullptr_t, T>::value>>
constexpr not_null(T u);
```
Constructs a `gsl_owner<T>` from a pointer that is convertible to `T` or that is a `T`. It [`Expects`](#user-content-H-assert-expects) that the provided pointer is not `== nullptr`.
```cpp
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr not_null(const not_null<U>& other);
```
Constructs a `gsl_owner<T>` from another `gsl_owner` where the other pointer is convertible to `T`. It [`Expects`](#user-content-H-assert-expects) that the provided pointer is not `== nullptr`.
```cpp
not_null(const not_null& other) = default;
not_null& operator=(const not_null& other) = default;
```
Copy construction and assignment.
```cpp
not_null(std::nullptr_t) = delete;
not_null& operator=(std::nullptr_t) = delete;
```
Construction from `std::nullptr_t` and assignment of `std::nullptr_t` are explicitly deleted.
##### Modifiers
```cpp
not_null& operator++() = delete;
not_null& operator--() = delete;
not_null operator++(int) = delete;
not_null operator--(int) = delete;
not_null& operator+=(std::ptrdiff_t) = delete;
not_null& operator-=(std::ptrdiff_t) = delete;
```
Explicitly deleted operators. Pointers point to single objects ([I.13: Do not pass an array as a single pointer](http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Ri-array)), so don't allow these operators.
##### Observers
```cpp
constexpr details::value_or_reference_return_t<T> get() const;
constexpr operator T() const { return get(); }
```
Get the underlying pointer.
```cpp
constexpr decltype(auto) operator->() const { return get(); }
constexpr decltype(auto) operator*() const { return *get(); }
```
Dereference the underlying pointer.
```cpp
void operator[](std::ptrdiff_t) const = delete;
```
Array index operator is explicitly deleted. Pointers point to single objects ([I.13: Do not pass an array as a single pointer](http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Ri-array)), so don't allow treating them as an array.
#### Non-member functions
```cpp
template <class T>
auto make_not_null(T&& t) noexcept;
```
Creates a `gsl::not_null` object, deducing the target type from the type of the argument.
```cpp
template <class T, class U>
auto operator==(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() == rhs.get()))
-> decltype(lhs.get() == rhs.get());
template <class T, class U>
auto operator!=(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() != rhs.get()))
-> decltype(lhs.get() != rhs.get());
template <class T, class U>
auto operator<(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() < rhs.get()))
-> decltype(lhs.get() < rhs.get());
template <class T, class U>
auto operator<=(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() <= rhs.get()))
-> decltype(lhs.get() <= rhs.get());
template <class T, class U>
auto operator>(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() > rhs.get()))
-> decltype(lhs.get() > rhs.get());
template <class T, class U>
auto operator>=(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() >= rhs.get()))
-> decltype(lhs.get() >= rhs.get());
```
Comparison of pointers that are convertible to each other.
##### Input/Output
```cpp
template <class T>
std::ostream& operator<<(std::ostream& os, const not_null<T>& val);
```
Performs stream output on a `not_null` pointer, invoking `os << val.get()`. This function is only available when `GSL_NO_IOSTREAMS` is not defined.
##### Modifiers
```cpp
template <class T, class U>
std::ptrdiff_t operator-(const not_null<T>&, const not_null<U>&) = delete;
template <class T>
not_null<T> operator-(const not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
not_null<T> operator+(const not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
not_null<T> operator+(std::ptrdiff_t, const not_null<T>&) = delete;
```
Addition and subtraction are explicitly deleted. Pointers point to single objects ([I.13: Do not pass an array as a single pointer](http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Ri-array)), so don't allow these operators.
##### STL integration
```cpp
template <class T>
struct std::hash<gsl::not_null<T>> { ... };
```
Specialization of `std::hash` for `gsl::not_null`.
### <a name="H-pointers-strict_not_null" />`gsl::strict_not_null`
`strict_not_null` is the same as [`not_null`](#user-content-H-pointers-not_null) except that the constructors are `explicit`.
The free function that deduces the target type from the type of the argument and creates a `gsl::strict_not_null` object is `gsl::make_strict_not_null`.
## <a name="H-span" />`<span>`
This header file exports the class `gsl::span`, a bounds-checked implementation of `std::span`.
- [`gsl::span`](#user-content-H-span-span)
### <a name="H-span-span" />`gsl::span`
```cpp
template <class ElementType, std::size_t Extent>
class span;
```
`gsl::span` is a view over memory. It does not own the memory and is only a way to access contiguous sequences of objects.
The extent can be either a fixed size or [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent).
The `gsl::span` is based on the standardized version of `std::span` which was added to C++20. Originally, the plan was to
deprecate `gsl::span` when `std::span` finished standardization, however that plan changed when the runtime bounds checking
was removed from `std::span`'s design.
The only difference between `gsl::span` and `std::span` is that `gsl::span` strictly enforces runtime bounds checking.
Any violations of the bounds check results in termination of the program.
Like `gsl::span`, `gsl::span`'s iterators also differ from `std::span`'s iterator in that all access operations are bounds checked.
#### Which version of span should I use?
##### Use `gsl::span` if
- you want to guarantee bounds safety in your project.
- All data accessing operations use bounds checking to ensure you are only accessing valid memory.
- your project uses C++14 or C++17.
- `std::span` is not available as it was not introduced into the STL until C++20.
##### Use `std::span` if
- your project is C++20 and you need the performance offered by `std::span`.
#### Types
```cpp
using element_type = ElementType;
using value_type = std::remove_cv_t<ElementType>;
using size_type = std::size_t;
using pointer = element_type*;
using const_pointer = const element_type*;
using reference = element_type&;
using const_reference = const element_type&;
using difference_type = std::ptrdiff_t;
using iterator = details::span_iterator<ElementType>;
using reverse_iterator = std::reverse_iterator<iterator>;
```
#### Member functions
```cpp
constexpr span() noexcept;
```
Constructs an empty `span`. This constructor is only available if `Extent` is 0 or [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent).
`span::data()` will return `nullptr`.
```cpp
constexpr explicit(Extent != gsl::dynamic_extent) span(pointer ptr, size_type count) noexcept;
```
Constructs a `span` from a pointer and a size. If `Extent` is not [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent),
then the constructor [`Expects`](#user-content-H-assert-expects) that `count == Extent`.
```cpp
constexpr explicit(Extent != gsl::dynamic_extent) span(pointer firstElem, pointer lastElem) noexcept;
```
Constructs a `span` from a pointer to the begin and the end of the data. If `Extent` is not [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent),
then the constructor [`Expects`](#user-content-H-assert-expects) that `lastElem - firstElem == Extent`.
```cpp
template <std::size_t N>
constexpr span(element_type (&arr)[N]) noexcept;
```
Constructs a `span` from a C style array. This overload is available if `Extent ==`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)
or `N == Extent`.
```cpp
template <class T, std::size_t N>
constexpr span(std::array<T, N>& arr) noexcept;
template <class T, std::size_t N>
constexpr span(const std::array<T, N>& arr) noexcept;
```
Constructs a `span` from a `std::array`. These overloads are available if `Extent ==`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)
or `N == Extent`, and if the array can be interpreted as a `ElementType` array.
```cpp
template <class Container>
constexpr explicit(Extent != gsl::dynamic_extent) span(Container& cont) noexcept;
template <class Container>
constexpr explicit(Extent != gsl::dynamic_extent) span(const Container& cont) noexcept;
```
Constructs a `span` from a container. These overloads are available if `Extent ==`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)
or `N == Extent`, and if the container can be interpreted as a contiguous `ElementType` array.
```cpp
constexpr span(const span& other) noexcept = default;
```
Copy constructor.
```cpp
template <class OtherElementType, std::size_t OtherExtent>
explicit(Extent != gsl::dynamic_extent && OtherExtent == dynamic_extent)
constexpr span(const span<OtherElementType, OtherExtent>& other) noexcept;
```
Constructs a `span` from another `span`. This constructor is available if `OtherExtent == Extent || Extent ==`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)` || OtherExtent ==`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)
and if `ElementType` and `OtherElementType` are compatible.
If `Extent !=`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent) and `OtherExtent ==`[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent),
then the constructor [`Expects`](#user-content-H-assert-expects) that `other.size() == Extent`.
```cpp
constexpr span& operator=(const span& other) noexcept = default;
```
Copy assignment
```cpp
template <std::size_t Count>
constexpr span<element_type, Count> first() const noexcept;
constexpr span<element_type, dynamic_extent> first(size_type count) const noexcept;
template <std::size_t Count>
constexpr span<element_type, Count> last() const noexcept;
constexpr span<element_type, dynamic_extent> last(size_type count) const noexcept;
```
Return a subspan of the first/last `Count` elements. [`Expects`](#user-content-H-assert-expects) that `Count` does not exceed the `span`'s size.
```cpp
template <std::size_t offset, std::size_t count = dynamic_extent>
constexpr auto subspan() const noexcept;
constexpr span<element_type, dynamic_extent>
subspan(size_type offset, size_type count = dynamic_extent) const noexcept;
```
Return a subspan starting at `offset` and having size `count`. [`Expects`](#user-content-H-assert-expects) that `offset` does not exceed the `span`'s size,
and that `offset == `[`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent) or `offset + count` does not exceed the `span`'s size.
If `count` is `gsl::dynamic_extent`, the number of elements in the subspan is `size() - offset`.
```cpp
constexpr size_type size() const noexcept;
constexpr size_type size_bytes() const noexcept;
```
Returns the size respective the size in bytes of the `span`.
```cpp
constexpr bool empty() const noexcept;
```
Is the `span` empty?
```cpp
constexpr reference operator[](size_type idx) const noexcept;
```
Returns a reference to the element at the given index. [`Expects`](#user-content-H-assert-expects) that `idx` is less than the `span`'s size.
```cpp
constexpr reference front() const noexcept;
constexpr reference back() const noexcept;
```
Returns a reference to the first/last element in the `span`. [`Expects`](#user-content-H-assert-expects) that the `span` is not empty.
```cpp
constexpr pointer data() const noexcept;
```
Returns a pointer to the beginning of the contained data.
```cpp
constexpr iterator begin() const noexcept;
constexpr iterator end() const noexcept;
constexpr reverse_iterator rbegin() const noexcept;
constexpr reverse_iterator rend() const noexcept;
```
Returns an iterator to the first/last normal/reverse iterator.
```cpp
template <class Type, std::size_t Extent>
span(Type (&)[Extent]) -> span<Type, Extent>;
template <class Type, std::size_t Size>
span(std::array<Type, Size>&) -> span<Type, Size>;
template <class Type, std::size_t Size>
span(const std::array<Type, Size>&) -> span<const Type, Size>;
template <class Container,
class Element = std::remove_pointer_t<decltype(std::declval<Container&>().data())>>
span(Container&) -> span<Element>;
template <class Container,
class Element = std::remove_pointer_t<decltype(std::declval<const Container&>().data())>>
span(const Container&) -> span<Element>;
```
Deduction guides.
```cpp
template <class ElementType, std::size_t Extent>
span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
as_bytes(span<ElementType, Extent> s) noexcept;
template <class ElementType, std::size_t Extent>
span<byte, details::calculate_byte_size<ElementType, Extent>::value>
as_writable_bytes(span<ElementType, Extent> s) noexcept;
```
Converts a `span` into a `span` of `byte`s.
`as_writable_bytes` will only be available for non-const `ElementType`s.
## <a name="H-span_ext" />`<span_ext>`
This file is a companion for and included by [`<gsl/span>`](#user-content-H-span), and should not be used on its own. It contains useful features that aren't part of the `std::span` API as found inside the STL `<span>` header (with the exception of [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent), which is included here due to implementation constraints).
- [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent)
- [`gsl::span`](#user-content-H-span_ext-span)
- [`gsl::span` comparison operators](#user-content-H-span_ext-span_comparison_operators)
- [`gsl::make_span`](#user-content-H-span_ext-make_span)
- [`gsl::at`](#user-content-H-span_ext-at)
- [`gsl::ssize`](#user-content-H-span_ext-ssize)
- [`gsl::span` iterator functions](#user-content-H-span_ext-span_iterator_functions)
### <a name="H-span_ext-dynamic_extent" />`gsl::dynamic_extent`
Defines the extent value to be used by all `gsl::span` with dynamic extent.
Note: `std::dynamic_extent` is exposed by the STL `<span>` header and so ideally `gsl::dynamic_extent` would be under [`<gsl/span>`](#user-content-H-span), but to avoid cyclic dependency issues it is under `<span_ext>` instead.
### <a name="H-span_ext-span" />`gsl::span`
```cpp
template <class ElementType, std::size_t Extent = dynamic_extent>
class span;
```
Forward declaration of `gsl::span`.
### <a name="H-span_ext-span_comparison_operators" />`gsl::span` comparison operators
```cpp
template <class ElementType, std::size_t FirstExtent, std::size_t SecondExtent>
constexpr bool operator==(span<ElementType, FirstExtent> l, span<ElementType, SecondExtent> r);
template <class ElementType, std::size_t FirstExtent, std::size_t SecondExtent>
constexpr bool operator!=(span<ElementType, FirstExtent> l, span<ElementType, SecondExtent> r);
template <class ElementType, std::size_t Extent>
constexpr bool operator<(span<ElementType, Extent> l, span<ElementType, Extent> r);
template <class ElementType, std::size_t Extent>
constexpr bool operator<=(span<ElementType, Extent> l, span<ElementType, Extent> r);
template <class ElementType, std::size_t Extent>
constexpr bool operator>(span<ElementType, Extent> l, span<ElementType, Extent> r);
template <class ElementType, std::size_t Extent>
constexpr bool operator>=(span<ElementType, Extent> l, span<ElementType, Extent> r);
```
The comparison operators for two `span`s lexicographically compare the elements in the `span`s.
### <a name="H-span_ext-make_span" />`gsl::make_span`
```cpp
template <class ElementType>
constexpr span<ElementType> make_span(ElementType* ptr, typename span<ElementType>::size_type count);
template <class ElementType>
constexpr span<ElementType> make_span(ElementType* firstElem, ElementType* lastElem);
template <class ElementType, std::size_t N>
constexpr span<ElementType, N> make_span(ElementType (&arr)[N]) noexcept;
template <class Container>
constexpr span<typename Container::value_type> make_span(Container& cont);
template <class Container>
constexpr span<const typename Container::value_type> make_span(const Container& cont);
template <class Ptr>
constexpr span<typename Ptr::element_type> make_span(Ptr& cont, std::size_t count);
template <class Ptr>
constexpr span<typename Ptr::element_type> make_span(Ptr& cont);
```
Utility function for creating a `span` with [`gsl::dynamic_extent`](#user-content-H-span_ext-dynamic_extent) from
- pointer and length,
- pointer to start and pointer to end,
- a C style array, or
- a container.
### <a name="H-span_ext-at" />`gsl::at`
```cpp
template <class ElementType, std::size_t Extent>
constexpr ElementType& at(span<ElementType, Extent> s, index i);
```
The function `gsl::at` offers a safe way to access data with index bounds checking.
This is the specialization of [`gsl::at`](#user-content-H-util-at) for [`span`](#user-content-H-span-span). It returns a reference to the `i`th element and
[`Expects`](#user-content-H-assert-expects) that the provided index is within the bounds of the `span`.
Note: `gsl::at` supports indexes up to `PTRDIFF_MAX`.
### <a name="H-span_ext-ssize" />`gsl::ssize`
```cpp
template <class ElementType, std::size_t Extent>
constexpr std::ptrdiff_t ssize(const span<ElementType, Extent>& s) noexcept;
```
Return the size of a [`span`](#user-content-H-span-span) as a `ptrdiff_t`.
### <a name="H-span_ext-span_iterator_functions" />`gsl::span` iterator functions
```cpp
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::iterator
begin(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent = dynamic_extent>
constexpr typename span<ElementType, Extent>::iterator
end(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
rbegin(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
rend(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::iterator
cbegin(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent = dynamic_extent>
constexpr typename span<ElementType, Extent>::iterator
cend(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
crbegin(const span<ElementType, Extent>& s) noexcept;
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
crend(const span<ElementType, Extent>& s) noexcept;
```
Free functions for getting a non-const/const begin/end normal/reverse iterator for a [`span`](#user-content-H-span-span).
## <a name="H-zstring" />`<zstring>`
This header exports a family of `*zstring` types.
A `gsl::XXzstring<T>` is a typedef to `T`. It adds no checks whatsoever, it is just for having a syntax to describe
that a pointer points to a zero terminated C style string. This helps static code analysis, and it helps human readers.
`basic_zstring` is a pointer to a C-string (zero-terminated array) with a templated char type. Used to implement the rest of the `*zstring` family.
`zstring` is a zero terminated `char` string.
`czstring` is a const zero terminated `char` string.
`wzstring` is a zero terminated `wchar_t` string.
`cwzstring` is a const zero terminated `wchar_t` string.
`u16zstring` is a zero terminated `char16_t` string.
`cu16zstring` is a const zero terminated `char16_t` string.
`u32zstring` is a zero terminated `char32_t` string.
`cu32zstring` is a const zero terminated `char32_t` string.
See [GSL.view](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-views) and [SL.str.3: Use zstring or czstring to refer to a C-style, zero-terminated, sequence of characters](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rstr-zstring).
## <a name="H-util" />`<util>`
This header contains utility functions and classes. This header works without exceptions being available. The parts that require
exceptions being available are in their own header file [narrow](#user-content-H-narrow).
See [GSL.util: Utilities](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#SS-utilities)
- [`gsl::narrow_cast`](#user-content-H-util-narrow_cast)
- [`gsl::final_action`](#user-content-H-util-final_action)
- [`gsl::at`](#user-content-H-util-at)
### <a name="H-util-index" />`gsl::index`
An alias to `std::ptrdiff_t`. It serves as the index type for all container indexes/subscripts/sizes.
### <a name="H-util-narrow_cast" />`gsl::narrow_cast`
`gsl::narrow_cast<T>(x)` is a named cast that is identical to a `static_cast<T>(x)`. It exists to make clear to static code analysis tools and to human readers that a lossy conversion is acceptable.
Note: compare the throwing version [`gsl::narrow`](#user-content-H-narrow-narrow) in header [narrow](#user-content-H-narrow).
See [ES.46: Avoid lossy (narrowing, truncating) arithmetic conversions](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Res-narrowing) and [ES.49: If you must use a cast, use a named cast](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Res-casts-named)
### <a name="H-util-final_action" />`gsl::final_action`
```cpp
template <class F>
class final_action { ... };
```
`final_action` allows you to ensure something gets run at the end of a scope.
See [E.19: Use a final_action object to express cleanup if no suitable resource handle is available](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Re-finally)
#### Member functions
```cpp
explicit final_action(const F& ff) noexcept;
explicit final_action(F&& ff) noexcept;
```
Construct an object with the action to invoke in the destructor.
```cpp
~final_action() noexcept;
```
The destructor will call the action that was passed in the constructor.
```cpp
final_action(final_action&& other) noexcept;
final_action(const final_action&) = delete;
void operator=(const final_action&) = delete;
void operator=(final_action&&) = delete;
```
Move construction is allowed. Copy construction is deleted. Copy and move assignment are also explicitly deleted.
#### <a name="H-util-finally" />Non-member functions
```cpp
template <class F>
auto finally(F&& f) noexcept;
```
Creates a `gsl::final_action` object, deducing the template argument type from the type of the argument.
### <a name="H-util-at" />`gsl::at`
The function `gsl::at` offers a safe way to access data with index bounds checking.
Note: `gsl::at` supports indexes up to `PTRDIFF_MAX`.
See [ES.42: Keep use of pointers simple and straightforward](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Res-ptr)
```cpp
template <class T, std::size_t N>
constexpr T& at(T (&arr)[N], const index i);
```
This overload returns a reference to the `i`s element of a C style array `arr`. It [`Expects`](#user-content-H-assert-expects) that the provided index is within the bounds of the array.
```cpp
template <class Cont>
constexpr auto at(Cont& cont, const index i) -> decltype(cont[cont.size()]);
```
This overload returns a reference to the `i`s element of the container `cont`. It [`Expects`](#user-content-H-assert-expects) that the provided index is within the bounds of the array.
```cpp
template <class T>
constexpr T at(const std::initializer_list<T> cont, const index i);
```
This overload returns a reference to the `i`s element of the initializer list `cont`. It [`Expects`](#user-content-H-assert-expects) that the provided index is within the bounds of the array.
```cpp
template <class T, std::size_t extent = std::dynamic_extent>
constexpr auto at(std::span<T, extent> sp, const index i) -> decltype(sp[sp.size()]);
```
This overload returns a reference to the `i`s element of the `std::span` `sp`. It [`Expects`](#user-content-H-assert-expects) that the provided index is within the bounds of the array.
For [`gsl::at`](#user-content-H-span_ext-at) for [`gsl::span`](#user-content-H-span-span) see header [`span_ext`](#user-content-H-span_ext).

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# Add include folders to the library and targets that consume it
# the SYSTEM keyword suppresses warnings for users of the library
#
# By adding this directory as an include directory the user gets a
# namespace effect.
#
# IE:
# #include <gsl/gsl>
if(PROJECT_IS_TOP_LEVEL)
target_include_directories(GSL INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
else()
target_include_directories(GSL SYSTEM INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
endif()

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_ALGORITHM_H
#define GSL_ALGORITHM_H
#include "assert" // for Expects
#include "span" // for dynamic_extent, span
#include <algorithm> // for copy_n
#include <cstddef> // for ptrdiff_t
#include <type_traits> // for is_assignable
#ifdef _MSC_VER
#pragma warning(push)
// turn off some warnings that are noisy about our Expects statements
#pragma warning(disable : 4127) // conditional expression is constant
#pragma warning(disable : 4996) // unsafe use of std::copy_n
#endif // _MSC_VER
namespace gsl
{
// Note: this will generate faster code than std::copy using span iterator in older msvc+stl
// not necessary for msvc since VS2017 15.8 (_MSC_VER >= 1915)
template <class SrcElementType, std::size_t SrcExtent, class DestElementType,
std::size_t DestExtent>
void copy(span<SrcElementType, SrcExtent> src, span<DestElementType, DestExtent> dest)
{
static_assert(std::is_assignable<decltype(*dest.data()), decltype(*src.data())>::value,
"Elements of source span can not be assigned to elements of destination span");
static_assert(SrcExtent == dynamic_extent || DestExtent == dynamic_extent ||
(SrcExtent <= DestExtent),
"Source range is longer than target range");
Expects(dest.size() >= src.size());
// clang-format off
GSL_SUPPRESS(stl.1) // NO-FORMAT: attribute
// clang-format on
std::copy_n(src.data(), src.size(), dest.data());
}
} // namespace gsl
#ifdef _MSC_VER
#pragma warning(pop)
#endif // _MSC_VER
#endif // GSL_ALGORITHM_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_ASSERT_H
#define GSL_ASSERT_H
//
// Temporary until MSVC STL supports no-exceptions mode.
// Currently terminate is a no-op in this mode, so we add termination behavior back
//
#if defined(_MSC_VER) && (defined(_KERNEL_MODE) || (defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS))
#define GSL_KERNEL_MODE
#define GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND
#include <intrin.h>
#define RANGE_CHECKS_FAILURE 0
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Winvalid-noreturn"
#endif // defined(__clang__)
#else // defined(_MSC_VER) && (defined(_KERNEL_MODE) || (defined(_HAS_EXCEPTIONS) &&
// !_HAS_EXCEPTIONS))
#include <exception>
#endif // defined(_MSC_VER) && (defined(_KERNEL_MODE) || (defined(_HAS_EXCEPTIONS) &&
// !_HAS_EXCEPTIONS))
//
// make suppress attributes parse for some compilers
// Hopefully temporary until suppression standardization occurs
//
#if defined(__clang__)
#define GSL_SUPPRESS(x) [[gsl::suppress(#x)]]
#else
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) && !defined(__NVCC__)
#define GSL_SUPPRESS(x) [[gsl::suppress(x)]]
#else
#define GSL_SUPPRESS(x)
#endif // _MSC_VER
#endif // __clang__
#if defined(__clang__) || defined(__GNUC__)
#define GSL_LIKELY(x) __builtin_expect(!!(x), 1)
#define GSL_UNLIKELY(x) __builtin_expect(!!(x), 0)
#else
#define GSL_LIKELY(x) (!!(x))
#define GSL_UNLIKELY(x) (!!(x))
#endif // defined(__clang__) || defined(__GNUC__)
//
// GSL_ASSUME(cond)
//
// Tell the optimizer that the predicate cond must hold. It is unspecified
// whether or not cond is actually evaluated.
//
#ifdef _MSC_VER
#define GSL_ASSUME(cond) __assume(cond)
#elif defined(__GNUC__)
#define GSL_ASSUME(cond) ((cond) ? static_cast<void>(0) : __builtin_unreachable())
#else
#define GSL_ASSUME(cond) static_cast<void>((cond) ? 0 : 0)
#endif
//
// GSL.assert: assertions
//
namespace gsl
{
namespace details
{
#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
typedef void(__cdecl* terminate_handler)();
// clang-format off
GSL_SUPPRESS(f.6) // NO-FORMAT: attribute
// clang-format on
[[noreturn]] inline void __cdecl default_terminate_handler()
{
__fastfail(RANGE_CHECKS_FAILURE);
}
inline gsl::details::terminate_handler& get_terminate_handler() noexcept
{
static terminate_handler handler = &default_terminate_handler;
return handler;
}
#endif // defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
[[noreturn]] inline void terminate() noexcept
{
#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
(*gsl::details::get_terminate_handler())();
#else
std::terminate();
#endif // defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
}
} // namespace details
} // namespace gsl
#define GSL_CONTRACT_CHECK(type, cond) \
(GSL_LIKELY(cond) ? static_cast<void>(0) : gsl::details::terminate())
#define Expects(cond) GSL_CONTRACT_CHECK("Precondition", cond)
#define Ensures(cond) GSL_CONTRACT_CHECK("Postcondition", cond)
#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND) && defined(__clang__)
#pragma clang diagnostic pop
#endif
#endif // GSL_ASSERT_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_BYTE_H
#define GSL_BYTE_H
#include <type_traits>
#ifdef _MSC_VER
#pragma warning(push)
// Turn MSVC /analyze rules that generate too much noise. TODO: fix in the tool.
#pragma warning(disable : 26493) // don't use c-style casts // TODO: MSVC suppression in templates
// does not always work
#ifndef GSL_USE_STD_BYTE
// this tests if we are under MSVC and the standard lib has std::byte and it is enabled
#if defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603
#define GSL_USE_STD_BYTE 1
#else // defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603
#define GSL_USE_STD_BYTE 0
#endif // defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603
#endif // GSL_USE_STD_BYTE
#else // _MSC_VER
#ifndef GSL_USE_STD_BYTE
#include <cstddef> /* __cpp_lib_byte */
// this tests if we are under GCC or Clang with enough -std=c++1z power to get us std::byte
// also check if libc++ version is sufficient (> 5.0) or libstdc++ actually contains std::byte
#if defined(__cplusplus) && (__cplusplus >= 201703L) && \
(defined(__cpp_lib_byte) && (__cpp_lib_byte >= 201603) || \
defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 5000))
#define GSL_USE_STD_BYTE 1
#else // defined(__cplusplus) && (__cplusplus >= 201703L) &&
// (defined(__cpp_lib_byte) && (__cpp_lib_byte >= 201603) ||
// defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 5000))
#define GSL_USE_STD_BYTE 0
#endif // defined(__cplusplus) && (__cplusplus >= 201703L) &&
// (defined(__cpp_lib_byte) && (__cpp_lib_byte >= 201603) ||
// defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 5000))
#endif // GSL_USE_STD_BYTE
#endif // _MSC_VER
// Use __may_alias__ attribute on gcc and clang
#if defined __clang__ || (defined(__GNUC__) && __GNUC__ > 5)
#define byte_may_alias __attribute__((__may_alias__))
#else // defined __clang__ || defined __GNUC__
#define byte_may_alias
#endif // defined __clang__ || defined __GNUC__
#if GSL_USE_STD_BYTE
#include <cstddef>
#endif
namespace gsl
{
#if GSL_USE_STD_BYTE
using std::byte;
using std::to_integer;
#else // GSL_USE_STD_BYTE
// This is a simple definition for now that allows
// use of byte within span<> to be standards-compliant
enum class byte_may_alias byte : unsigned char
{
};
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte& operator<<=(byte& b, IntegerType shift) noexcept
{
return b = byte(static_cast<unsigned char>(b) << shift);
}
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte operator<<(byte b, IntegerType shift) noexcept
{
return byte(static_cast<unsigned char>(b) << shift);
}
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept
{
return b = byte(static_cast<unsigned char>(b) >> shift);
}
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr byte operator>>(byte b, IntegerType shift) noexcept
{
return byte(static_cast<unsigned char>(b) >> shift);
}
constexpr byte& operator|=(byte& l, byte r) noexcept
{
return l = byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
}
constexpr byte operator|(byte l, byte r) noexcept
{
return byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
}
constexpr byte& operator&=(byte& l, byte r) noexcept
{
return l = byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
}
constexpr byte operator&(byte l, byte r) noexcept
{
return byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
}
constexpr byte& operator^=(byte& l, byte r) noexcept
{
return l = byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
}
constexpr byte operator^(byte l, byte r) noexcept
{
return byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
}
constexpr byte operator~(byte b) noexcept { return byte(~static_cast<unsigned char>(b)); }
template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
constexpr IntegerType to_integer(byte b) noexcept
{
return static_cast<IntegerType>(b);
}
#endif // GSL_USE_STD_BYTE
template <typename T>
// NOTE: need suppression since c++14 does not allow "return {t}"
// GSL_SUPPRESS(type.4) // NO-FORMAT: attribute // TODO: suppression does not work
constexpr byte to_byte(T t) noexcept
{
static_assert(std::is_same<T, unsigned char>::value,
"gsl::to_byte(t) must be provided an unsigned char, otherwise data loss may occur. "
"If you are calling to_byte with an integer constant use: gsl::to_byte<t>() version.");
return byte(t);
}
template <int I>
constexpr byte to_byte() noexcept
{
static_assert(I >= 0 && I <= 255,
"gsl::byte only has 8 bits of storage, values must be in range 0-255");
return static_cast<byte>(I);
}
} // namespace gsl
#ifdef _MSC_VER
#pragma warning(pop)
#endif // _MSC_VER
#endif // GSL_BYTE_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_GSL_H
#define GSL_GSL_H
// IWYU pragma: begin_exports
#include "algorithm" // copy
#include "assert" // Ensures/Expects
#include "byte" // byte
#include "pointers" // owner, not_null
#include "span" // span
#include "zstring" // zstring
#include "util" // finally()/narrow_cast()...
#ifdef __cpp_exceptions
#include "narrow" // narrow()
#endif
// IWYU pragma: end_exports
#endif // GSL_GSL_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_NARROW_H
#define GSL_NARROW_H
#include "assert" // for GSL_SUPPRESS
#include "util" // for narrow_cast
#include <exception> // for std::exception
namespace gsl
{
struct narrowing_error : public std::exception
{
const char* what() const noexcept override { return "narrowing_error"; }
};
// narrow() : a checked version of narrow_cast() that throws if the cast changed the value
template <class T, class U, typename std::enable_if<std::is_arithmetic<T>::value>::type* = nullptr>
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
GSL_SUPPRESS(es.46) // NO-FORMAT: attribute // The warning suggests that a floating->unsigned conversion can occur
// in the static_cast below, and that gsl::narrow should be used instead.
// Suppress this warning, since gsl::narrow is defined in terms of
// static_cast
// clang-format on
constexpr T narrow(U u)
{
constexpr const bool is_different_signedness =
(std::is_signed<T>::value != std::is_signed<U>::value);
GSL_SUPPRESS(es.103) // NO-FORMAT: attribute // don't overflow
GSL_SUPPRESS(es.104) // NO-FORMAT: attribute // don't underflow
GSL_SUPPRESS(p.2) // NO-FORMAT: attribute // don't rely on undefined behavior
const T t = narrow_cast<T>(u); // While this is technically undefined behavior in some cases (i.e., if the source value is of floating-point type
// and cannot fit into the destination integral type), the resultant behavior is benign on the platforms
// that we target (i.e., no hardware trap representations are hit).
#if defined(__clang__) || defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
#endif
// Note: NaN will always throw, since NaN != NaN
if (static_cast<U>(t) != u || (is_different_signedness && ((t < T{}) != (u < U{}))))
{
throw narrowing_error{};
}
#if defined(__clang__) || defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
return t;
}
template <class T, class U, typename std::enable_if<!std::is_arithmetic<T>::value>::type* = nullptr>
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
constexpr T narrow(U u)
{
const T t = narrow_cast<T>(u);
if (static_cast<U>(t) != u)
{
throw narrowing_error{};
}
return t;
}
} // namespace gsl
#endif // GSL_NARROW_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_POINTERS_H
#define GSL_POINTERS_H
#include "assert" // for Ensures, Expects
#include <cstddef> // for ptrdiff_t, nullptr_t, size_t
#include <functional> // for less, greater
#include <memory> // for shared_ptr, unique_ptr, hash
#include <type_traits> // for enable_if_t, is_convertible, is_assignable
#include <utility> // for declval, forward
#if !defined(GSL_NO_IOSTREAMS)
#include <iosfwd> // for ostream
#endif // !defined(GSL_NO_IOSTREAMS)
namespace gsl
{
namespace details
{
template <typename T, typename = void>
struct is_comparable_to_nullptr : std::false_type
{
};
template <typename T>
struct is_comparable_to_nullptr<
T,
std::enable_if_t<std::is_convertible<decltype(std::declval<T>() != nullptr), bool>::value>>
: std::true_type
{
};
// Resolves to the more efficient of `const T` or `const T&`, in the context of returning a const-qualified value
// of type T.
//
// Copied from cppfront's implementation of the CppCoreGuidelines F.16 (https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rf-in)
template<typename T>
using value_or_reference_return_t = std::conditional_t<
sizeof(T) < 2*sizeof(void*) && std::is_trivially_copy_constructible<T>::value,
const T,
const T&>;
} // namespace details
//
// GSL.owner: ownership pointers
//
using std::shared_ptr;
using std::unique_ptr;
//
// owner
//
// `gsl::owner<T>` is designed as a safety mechanism for code that must deal directly with raw pointers that own memory.
// Ideally such code should be restricted to the implementation of low-level abstractions. `gsl::owner` can also be used
// as a stepping point in converting legacy code to use more modern RAII constructs, such as smart pointers.
//
// T must be a pointer type
// - disallow construction from any type other than pointer type
//
template <class T, class = std::enable_if_t<std::is_pointer<T>::value>>
using owner = T;
//
// not_null
//
// Restricts a pointer or smart pointer to only hold non-null values.
//
// Has zero size overhead over T.
//
// If T is a pointer (i.e. T == U*) then
// - allow construction from U*
// - disallow construction from nullptr_t
// - disallow default construction
// - ensure construction from null U* fails
// - allow implicit conversion to U*
//
template <class T>
class not_null
{
public:
static_assert(details::is_comparable_to_nullptr<T>::value, "T cannot be compared to nullptr.");
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr not_null(U&& u) noexcept(std::is_nothrow_move_constructible<T>::value) : ptr_(std::forward<U>(u))
{
Expects(ptr_ != nullptr);
}
template <typename = std::enable_if_t<!std::is_same<std::nullptr_t, T>::value>>
constexpr not_null(T u) noexcept(std::is_nothrow_move_constructible<T>::value) : ptr_(std::move(u))
{
Expects(ptr_ != nullptr);
}
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr not_null(const not_null<U>& other) noexcept(std::is_nothrow_move_constructible<T>::value) : not_null(other.get())
{}
not_null(const not_null& other) = default;
not_null& operator=(const not_null& other) = default;
constexpr details::value_or_reference_return_t<T> get() const
noexcept(noexcept(details::value_or_reference_return_t<T>{std::declval<T&>()}))
{
return ptr_;
}
constexpr operator T() const { return get(); }
constexpr decltype(auto) operator->() const { return get(); }
constexpr decltype(auto) operator*() const { return *get(); }
// prevents compilation when someone attempts to assign a null pointer constant
not_null(std::nullptr_t) = delete;
not_null& operator=(std::nullptr_t) = delete;
// unwanted operators...pointers only point to single objects!
not_null& operator++() = delete;
not_null& operator--() = delete;
not_null operator++(int) = delete;
not_null operator--(int) = delete;
not_null& operator+=(std::ptrdiff_t) = delete;
not_null& operator-=(std::ptrdiff_t) = delete;
void operator[](std::ptrdiff_t) const = delete;
private:
T ptr_;
};
template <class T>
auto make_not_null(T&& t) noexcept
{
return not_null<std::remove_cv_t<std::remove_reference_t<T>>>{std::forward<T>(t)};
}
#if !defined(GSL_NO_IOSTREAMS)
template <class T>
std::ostream& operator<<(std::ostream& os, const not_null<T>& val)
{
os << val.get();
return os;
}
#endif // !defined(GSL_NO_IOSTREAMS)
template <class T, class U>
auto operator==(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() == rhs.get()))
-> decltype(lhs.get() == rhs.get())
{
return lhs.get() == rhs.get();
}
template <class T, class U>
auto operator!=(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(lhs.get() != rhs.get()))
-> decltype(lhs.get() != rhs.get())
{
return lhs.get() != rhs.get();
}
template <class T, class U>
auto operator<(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(std::less<>{}(lhs.get(), rhs.get())))
-> decltype(std::less<>{}(lhs.get(), rhs.get()))
{
return std::less<>{}(lhs.get(), rhs.get());
}
template <class T, class U>
auto operator<=(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(std::less_equal<>{}(lhs.get(), rhs.get())))
-> decltype(std::less_equal<>{}(lhs.get(), rhs.get()))
{
return std::less_equal<>{}(lhs.get(), rhs.get());
}
template <class T, class U>
auto operator>(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(std::greater<>{}(lhs.get(), rhs.get())))
-> decltype(std::greater<>{}(lhs.get(), rhs.get()))
{
return std::greater<>{}(lhs.get(), rhs.get());
}
template <class T, class U>
auto operator>=(const not_null<T>& lhs,
const not_null<U>& rhs) noexcept(noexcept(std::greater_equal<>{}(lhs.get(), rhs.get())))
-> decltype(std::greater_equal<>{}(lhs.get(), rhs.get()))
{
return std::greater_equal<>{}(lhs.get(), rhs.get());
}
// more unwanted operators
template <class T, class U>
std::ptrdiff_t operator-(const not_null<T>&, const not_null<U>&) = delete;
template <class T>
not_null<T> operator-(const not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
not_null<T> operator+(const not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
not_null<T> operator+(std::ptrdiff_t, const not_null<T>&) = delete;
template <class T, class U = decltype(std::declval<const T&>().get()), bool = std::is_default_constructible<std::hash<U>>::value>
struct not_null_hash
{
std::size_t operator()(const T& value) const { return std::hash<U>{}(value.get()); }
};
template <class T, class U>
struct not_null_hash<T, U, false>
{
not_null_hash() = delete;
not_null_hash(const not_null_hash&) = delete;
not_null_hash& operator=(const not_null_hash&) = delete;
};
} // namespace gsl
namespace std
{
template <class T>
struct hash<gsl::not_null<T>> : gsl::not_null_hash<gsl::not_null<T>>
{
};
} // namespace std
namespace gsl
{
//
// strict_not_null
//
// Restricts a pointer or smart pointer to only hold non-null values,
//
// - provides a strict (i.e. explicit constructor from T) wrapper of not_null
// - to be used for new code that wishes the design to be cleaner and make not_null
// checks intentional, or in old code that would like to make the transition.
//
// To make the transition from not_null, incrementally replace not_null
// by strict_not_null and fix compilation errors
//
// Expect to
// - remove all unneeded conversions from raw pointer to not_null and back
// - make API clear by specifying not_null in parameters where needed
// - remove unnecessary asserts
//
template <class T>
class strict_not_null : public not_null<T>
{
public:
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr explicit strict_not_null(U&& u) : not_null<T>(std::forward<U>(u))
{}
template <typename = std::enable_if_t<!std::is_same<std::nullptr_t, T>::value>>
constexpr explicit strict_not_null(T u) : not_null<T>(u)
{}
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr strict_not_null(const not_null<U>& other) : not_null<T>(other)
{}
template <typename U, typename = std::enable_if_t<std::is_convertible<U, T>::value>>
constexpr strict_not_null(const strict_not_null<U>& other) : not_null<T>(other)
{}
// To avoid invalidating the "not null" invariant, the contained pointer is actually copied
// instead of moved. If it is a custom pointer, its constructor could in theory throw exceptions.
strict_not_null(strict_not_null&& other) noexcept(std::is_nothrow_copy_constructible<T>::value) = default;
strict_not_null(const strict_not_null& other) = default;
strict_not_null& operator=(const strict_not_null& other) = default;
strict_not_null& operator=(const not_null<T>& other)
{
not_null<T>::operator=(other);
return *this;
}
// prevents compilation when someone attempts to assign a null pointer constant
strict_not_null(std::nullptr_t) = delete;
strict_not_null& operator=(std::nullptr_t) = delete;
// unwanted operators...pointers only point to single objects!
strict_not_null& operator++() = delete;
strict_not_null& operator--() = delete;
strict_not_null operator++(int) = delete;
strict_not_null operator--(int) = delete;
strict_not_null& operator+=(std::ptrdiff_t) = delete;
strict_not_null& operator-=(std::ptrdiff_t) = delete;
void operator[](std::ptrdiff_t) const = delete;
};
// more unwanted operators
template <class T, class U>
std::ptrdiff_t operator-(const strict_not_null<T>&, const strict_not_null<U>&) = delete;
template <class T>
strict_not_null<T> operator-(const strict_not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
strict_not_null<T> operator+(const strict_not_null<T>&, std::ptrdiff_t) = delete;
template <class T>
strict_not_null<T> operator+(std::ptrdiff_t, const strict_not_null<T>&) = delete;
template <class T>
auto make_strict_not_null(T&& t) noexcept
{
return strict_not_null<std::remove_cv_t<std::remove_reference_t<T>>>{std::forward<T>(t)};
}
#if (defined(__cpp_deduction_guides) && (__cpp_deduction_guides >= 201611L))
// deduction guides to prevent the ctad-maybe-unsupported warning
template <class T>
not_null(T) -> not_null<T>;
template <class T>
strict_not_null(T) -> strict_not_null<T>;
#endif // ( defined(__cpp_deduction_guides) && (__cpp_deduction_guides >= 201611L) )
} // namespace gsl
namespace std
{
template <class T>
struct hash<gsl::strict_not_null<T>> : gsl::not_null_hash<gsl::strict_not_null<T>>
{
};
} // namespace std
#endif // GSL_POINTERS_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_SPAN_H
#define GSL_SPAN_H
#include "assert" // for Expects
#include "byte" // for byte
#include "span_ext" // for span specialization of gsl::at and other span-related extensions
#include "util" // for narrow_cast
#include <array> // for array
#include <cstddef> // for ptrdiff_t, size_t, nullptr_t
#include <iterator> // for reverse_iterator, distance, random_access_...
#include <memory> // for pointer_traits
#include <type_traits> // for enable_if_t, declval, is_convertible, inte...
#if defined(__has_include) && __has_include(<version>)
#include <version>
#endif
#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(push)
// turn off some warnings that are noisy about our Expects statements
#pragma warning(disable : 4127) // conditional expression is constant
#pragma warning( \
disable : 4146) // unary minus operator applied to unsigned type, result still unsigned
#pragma warning(disable : 4702) // unreachable code
// Turn MSVC /analyze rules that generate too much noise. TODO: fix in the tool.
#pragma warning(disable : 26495) // uninitialized member when constructor calls constructor
#pragma warning(disable : 26446) // parser bug does not allow attributes on some templates
#endif // _MSC_VER
// See if we have enough C++17 power to use a static constexpr data member
// without needing an out-of-line definition
#if !(defined(__cplusplus) && (__cplusplus >= 201703L))
#define GSL_USE_STATIC_CONSTEXPR_WORKAROUND
#endif // !(defined(__cplusplus) && (__cplusplus >= 201703L))
// GCC 7 does not like the signed unsigned mismatch (size_t ptrdiff_t)
// While there is a conversion from signed to unsigned, it happens at
// compiletime, so the compiler wouldn't have to warn indiscriminately, but
// could check if the source value actually doesn't fit into the target type
// and only warn in those cases.
#if defined(__GNUC__) && __GNUC__ > 6
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
// Turn off clang unsafe buffer warnings as all accessed are guarded by runtime checks
#if defined(__clang__)
#if __has_warning("-Wunsafe-buffer-usage")
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
#endif // __has_warning("-Wunsafe-buffer-usage")
#endif // defined(__clang__)
namespace gsl
{
// implementation details
namespace details
{
template <class T>
struct is_span_oracle : std::false_type
{
};
template <class ElementType, std::size_t Extent>
struct is_span_oracle<gsl::span<ElementType, Extent>> : std::true_type
{
};
template <class T>
struct is_span : public is_span_oracle<std::remove_cv_t<T>>
{
};
template <class T>
struct is_std_array_oracle : std::false_type
{
};
template <class ElementType, std::size_t Extent>
struct is_std_array_oracle<std::array<ElementType, Extent>> : std::true_type
{
};
template <class T>
struct is_std_array : is_std_array_oracle<std::remove_cv_t<T>>
{
};
template <std::size_t From, std::size_t To>
struct is_allowed_extent_conversion
: std::integral_constant<bool, From == To || To == dynamic_extent>
{
};
template <class From, class To>
struct is_allowed_element_type_conversion
: std::integral_constant<bool, std::is_convertible<From (*)[], To (*)[]>::value>
{
};
template <class Type>
class span_iterator
{
public:
#if defined(__cpp_lib_ranges) || (defined(_MSVC_STL_VERSION) && defined(__cpp_lib_concepts))
using iterator_concept = std::contiguous_iterator_tag;
#endif // __cpp_lib_ranges
using iterator_category = std::random_access_iterator_tag;
using value_type = std::remove_cv_t<Type>;
using difference_type = std::ptrdiff_t;
using pointer = Type*;
using reference = Type&;
#ifdef _MSC_VER
using _Unchecked_type = pointer;
using _Prevent_inheriting_unwrap = span_iterator;
#endif // _MSC_VER
constexpr span_iterator() = default;
constexpr span_iterator(pointer begin, pointer end, pointer current)
: begin_(begin), end_(end), current_(current)
{}
constexpr operator span_iterator<const Type>() const noexcept
{
return {begin_, end_, current_};
}
constexpr reference operator*() const noexcept
{
Expects(begin_ && end_);
Expects(begin_ <= current_ && current_ < end_);
return *current_;
}
constexpr pointer operator->() const noexcept
{
Expects(begin_ && end_);
Expects(begin_ <= current_ && current_ < end_);
return current_;
}
constexpr span_iterator& operator++() noexcept
{
Expects(begin_ && current_ && end_);
Expects(current_ < end_);
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
++current_;
return *this;
}
constexpr span_iterator operator++(int) noexcept
{
span_iterator ret = *this;
++*this;
return ret;
}
constexpr span_iterator& operator--() noexcept
{
Expects(begin_ && end_);
Expects(begin_ < current_);
--current_;
return *this;
}
constexpr span_iterator operator--(int) noexcept
{
span_iterator ret = *this;
--*this;
return ret;
}
constexpr span_iterator& operator+=(const difference_type n) noexcept
{
if (n != 0) Expects(begin_ && current_ && end_);
if (n > 0) Expects(end_ - current_ >= n);
if (n < 0) Expects(current_ - begin_ >= -n);
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
current_ += n;
return *this;
}
constexpr span_iterator operator+(const difference_type n) const noexcept
{
span_iterator ret = *this;
ret += n;
return ret;
}
friend constexpr span_iterator operator+(const difference_type n,
const span_iterator& rhs) noexcept
{
return rhs + n;
}
constexpr span_iterator& operator-=(const difference_type n) noexcept
{
if (n != 0) Expects(begin_ && current_ && end_);
if (n > 0) Expects(current_ - begin_ >= n);
if (n < 0) Expects(end_ - current_ >= -n);
GSL_SUPPRESS(bounds .1)
current_ -= n;
return *this;
}
constexpr span_iterator operator-(const difference_type n) const noexcept
{
span_iterator ret = *this;
ret -= n;
return ret;
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr difference_type operator-(const span_iterator<Type2>& rhs) const noexcept
{
Expects(begin_ == rhs.begin_ && end_ == rhs.end_);
return current_ - rhs.current_;
}
constexpr reference operator[](const difference_type n) const noexcept
{
return *(*this + n);
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr bool operator==(const span_iterator<Type2>& rhs) const noexcept
{
Expects(begin_ == rhs.begin_ && end_ == rhs.end_);
return current_ == rhs.current_;
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr bool operator!=(const span_iterator<Type2>& rhs) const noexcept
{
return !(*this == rhs);
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr bool operator<(const span_iterator<Type2>& rhs) const noexcept
{
Expects(begin_ == rhs.begin_ && end_ == rhs.end_);
return current_ < rhs.current_;
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr bool operator>(const span_iterator<Type2>& rhs) const noexcept
{
return rhs < *this;
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr bool operator<=(const span_iterator<Type2>& rhs) const noexcept
{
return !(rhs < *this);
}
template <
class Type2,
std::enable_if_t<std::is_same<std::remove_cv_t<Type2>, value_type>::value, int> = 0>
constexpr bool operator>=(const span_iterator<Type2>& rhs) const noexcept
{
return !(*this < rhs);
}
#ifdef _MSC_VER
// MSVC++ iterator debugging support; allows STL algorithms in 15.8+
// to unwrap span_iterator to a pointer type after a range check in STL
// algorithm calls
friend constexpr void _Verify_range(span_iterator lhs, span_iterator rhs) noexcept
{ // test that [lhs, rhs) forms a valid range inside an STL algorithm
Expects(lhs.begin_ == rhs.begin_ // range spans have to match
&& lhs.end_ == rhs.end_ &&
lhs.current_ <= rhs.current_); // range must not be transposed
}
constexpr void _Verify_offset(const difference_type n) const noexcept
{ // test that *this + n is within the range of this call
if (n != 0) Expects(begin_ && current_ && end_);
if (n > 0) Expects(end_ - current_ >= n);
if (n < 0) Expects(current_ - begin_ >= -n);
}
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr pointer _Unwrapped() const noexcept
{ // after seeking *this to a high water mark, or using one of the
// _Verify_xxx functions above, unwrap this span_iterator to a raw
// pointer
return current_;
}
// Tell the STL that span_iterator should not be unwrapped if it can't
// validate in advance, even in release / optimized builds:
#if defined(GSL_USE_STATIC_CONSTEXPR_WORKAROUND)
static constexpr const bool _Unwrap_when_unverified = false;
#else
static constexpr bool _Unwrap_when_unverified = false;
#endif
// clang-format off
GSL_SUPPRESS(con.3) // NO-FORMAT: attribute // TODO: false positive
// clang-format on
constexpr void _Seek_to(const pointer p) noexcept
{ // adjust the position of *this to previously verified location p
// after _Unwrapped
current_ = p;
}
#endif
pointer begin_ = nullptr;
pointer end_ = nullptr;
pointer current_ = nullptr;
template <typename Ptr>
friend struct std::pointer_traits;
};
}} // namespace gsl::details
namespace std
{
template <class Type>
struct pointer_traits<::gsl::details::span_iterator<Type>>
{
using pointer = ::gsl::details::span_iterator<Type>;
using element_type = Type;
using difference_type = ptrdiff_t;
static constexpr element_type* to_address(const pointer i) noexcept { return i.current_; }
};
} // namespace std
namespace gsl { namespace details {
template <std::size_t Ext>
class extent_type
{
public:
using size_type = std::size_t;
constexpr extent_type() noexcept = default;
constexpr explicit extent_type(extent_type<dynamic_extent>);
constexpr explicit extent_type(size_type size) { Expects(size == Ext); }
constexpr size_type size() const noexcept { return Ext; }
private:
#if defined(GSL_USE_STATIC_CONSTEXPR_WORKAROUND)
static constexpr const size_type size_ = Ext; // static size equal to Ext
#else
static constexpr size_type size_ = Ext; // static size equal to Ext
#endif
};
template <>
class extent_type<dynamic_extent>
{
public:
using size_type = std::size_t;
template <size_type Other>
constexpr explicit extent_type(extent_type<Other> ext) : size_(ext.size())
{}
constexpr explicit extent_type(size_type size) : size_(size)
{
Expects(size != dynamic_extent);
}
constexpr size_type size() const noexcept { return size_; }
private:
size_type size_;
};
template <std::size_t Ext>
constexpr extent_type<Ext>::extent_type(extent_type<dynamic_extent> ext)
{
Expects(ext.size() == Ext);
}
template <class ElementType, std::size_t Extent, std::size_t Offset, std::size_t Count>
struct calculate_subspan_type
{
using type = span<ElementType, Count != dynamic_extent
? Count
: (Extent != dynamic_extent ? Extent - Offset : Extent)>;
};
} // namespace details
// [span], class template span
template <class ElementType, std::size_t Extent>
class span
{
public:
// constants and types
using element_type = ElementType;
using value_type = std::remove_cv_t<ElementType>;
using size_type = std::size_t;
using pointer = element_type*;
using const_pointer = const element_type*;
using reference = element_type&;
using const_reference = const element_type&;
using difference_type = std::ptrdiff_t;
using iterator = details::span_iterator<ElementType>;
using reverse_iterator = std::reverse_iterator<iterator>;
#if defined(GSL_USE_STATIC_CONSTEXPR_WORKAROUND)
static constexpr const size_type extent{Extent};
#else
static constexpr size_type extent{Extent};
#endif
// [span.cons], span constructors, copy, assignment, and destructor
template <bool Dependent = false,
// "Dependent" is needed to make "std::enable_if_t<Dependent || Extent == 0 || Extent
// == dynamic_extent>" SFINAE, since "std::enable_if_t<Extent == 0 || Extent ==
// dynamic_extent>" is ill-formed when Extent is greater than 0.
class = std::enable_if_t<(Dependent ||
details::is_allowed_extent_conversion<0, Extent>::value)>>
constexpr span() noexcept : storage_(nullptr, details::extent_type<0>())
{}
template <std::size_t MyExtent = Extent, std::enable_if_t<MyExtent != dynamic_extent, int> = 0>
constexpr explicit span(pointer ptr, size_type count) noexcept : storage_(ptr, count)
{
Expects(count == Extent);
}
template <std::size_t MyExtent = Extent, std::enable_if_t<MyExtent == dynamic_extent, int> = 0>
constexpr span(pointer ptr, size_type count) noexcept : storage_(ptr, count)
{}
template <std::size_t MyExtent = Extent, std::enable_if_t<MyExtent != dynamic_extent, int> = 0>
constexpr explicit span(pointer firstElem, pointer lastElem) noexcept
: storage_(firstElem, narrow_cast<std::size_t>(lastElem - firstElem))
{
Expects(lastElem - firstElem == static_cast<difference_type>(Extent));
}
template <std::size_t MyExtent = Extent, std::enable_if_t<MyExtent == dynamic_extent, int> = 0>
constexpr span(pointer firstElem, pointer lastElem) noexcept
: storage_(firstElem, narrow_cast<std::size_t>(lastElem - firstElem))
{}
template <std::size_t N,
std::enable_if_t<details::is_allowed_extent_conversion<N, Extent>::value, int> = 0>
constexpr span(element_type (&arr)[N]) noexcept
: storage_(KnownNotNull{arr}, details::extent_type<N>())
{}
template <
class T, std::size_t N,
std::enable_if_t<(details::is_allowed_extent_conversion<N, Extent>::value &&
details::is_allowed_element_type_conversion<T, element_type>::value),
int> = 0>
constexpr span(std::array<T, N>& arr) noexcept
: storage_(KnownNotNull{arr.data()}, details::extent_type<N>())
{}
template <class T, std::size_t N,
std::enable_if_t<
(details::is_allowed_extent_conversion<N, Extent>::value &&
details::is_allowed_element_type_conversion<const T, element_type>::value),
int> = 0>
constexpr span(const std::array<T, N>& arr) noexcept
: storage_(KnownNotNull{arr.data()}, details::extent_type<N>())
{}
// NB: the SFINAE on these constructors uses .data() as an incomplete/imperfect proxy for the
// requirement on Container to be a contiguous sequence container.
template <std::size_t MyExtent = Extent, class Container,
std::enable_if_t<
MyExtent != dynamic_extent && !details::is_span<Container>::value &&
!details::is_std_array<Container>::value &&
std::is_pointer<decltype(std::declval<Container&>().data())>::value &&
std::is_convertible<
std::remove_pointer_t<decltype(std::declval<Container&>().data())> (*)[],
element_type (*)[]>::value,
int> = 0>
constexpr explicit span(Container& cont) noexcept : span(cont.data(), cont.size())
{}
template <std::size_t MyExtent = Extent, class Container,
std::enable_if_t<
MyExtent == dynamic_extent && !details::is_span<Container>::value &&
!details::is_std_array<Container>::value &&
std::is_pointer<decltype(std::declval<Container&>().data())>::value &&
std::is_convertible<
std::remove_pointer_t<decltype(std::declval<Container&>().data())> (*)[],
element_type (*)[]>::value,
int> = 0>
constexpr span(Container& cont) noexcept : span(cont.data(), cont.size())
{}
template <
std::size_t MyExtent = Extent, class Container,
std::enable_if_t<
MyExtent != dynamic_extent && std::is_const<element_type>::value &&
!details::is_span<Container>::value && !details::is_std_array<Container>::value &&
std::is_pointer<decltype(std::declval<const Container&>().data())>::value &&
std::is_convertible<
std::remove_pointer_t<decltype(std::declval<const Container&>().data())> (*)[],
element_type (*)[]>::value,
int> = 0>
constexpr explicit span(const Container& cont) noexcept : span(cont.data(), cont.size())
{}
template <
std::size_t MyExtent = Extent, class Container,
std::enable_if_t<
MyExtent == dynamic_extent && std::is_const<element_type>::value &&
!details::is_span<Container>::value && !details::is_std_array<Container>::value &&
std::is_pointer<decltype(std::declval<const Container&>().data())>::value &&
std::is_convertible<
std::remove_pointer_t<decltype(std::declval<const Container&>().data())> (*)[],
element_type (*)[]>::value,
int> = 0>
constexpr span(const Container& cont) noexcept : span(cont.data(), cont.size())
{}
constexpr span(const span& other) noexcept = default;
template <class OtherElementType, std::size_t OtherExtent, std::size_t MyExtent = Extent,
std::enable_if_t<(MyExtent == dynamic_extent || MyExtent == OtherExtent) &&
details::is_allowed_element_type_conversion<OtherElementType,
element_type>::value,
int> = 0>
constexpr span(const span<OtherElementType, OtherExtent>& other) noexcept
: storage_(other.data(), details::extent_type<OtherExtent>(other.size()))
{}
template <class OtherElementType, std::size_t OtherExtent, std::size_t MyExtent = Extent,
std::enable_if_t<MyExtent != dynamic_extent && OtherExtent == dynamic_extent &&
details::is_allowed_element_type_conversion<OtherElementType,
element_type>::value,
int> = 0>
constexpr explicit span(const span<OtherElementType, OtherExtent>& other) noexcept
: storage_(other.data(), details::extent_type<OtherExtent>(other.size()))
{}
~span() noexcept = default;
constexpr span& operator=(const span& other) noexcept = default;
// [span.sub], span subviews
template <std::size_t Count>
constexpr span<element_type, Count> first() const noexcept
{
Expects(Count <= size());
return span<element_type, Count>{data(), Count};
}
template <std::size_t Count>
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr span<element_type, Count> last() const noexcept
{
Expects(Count <= size());
return span<element_type, Count>{data() + (size() - Count), Count};
}
template <std::size_t Offset, std::size_t Count = dynamic_extent>
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr auto subspan() const noexcept ->
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type
{
Expects((size() >= Offset) && (Count == dynamic_extent || (Count <= size() - Offset)));
using type =
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type;
return type{data() + Offset, Count == dynamic_extent ? size() - Offset : Count};
}
constexpr span<element_type, dynamic_extent> first(size_type count) const noexcept
{
Expects(count <= size());
return {data(), count};
}
constexpr span<element_type, dynamic_extent> last(size_type count) const noexcept
{
Expects(count <= size());
return make_subspan(size() - count, dynamic_extent, subspan_selector<Extent>{});
}
constexpr span<element_type, dynamic_extent>
subspan(size_type offset, size_type count = dynamic_extent) const noexcept
{
return make_subspan(offset, count, subspan_selector<Extent>{});
}
// [span.obs], span observers
constexpr size_type size() const noexcept { return storage_.size(); }
constexpr size_type size_bytes() const noexcept { return size() * sizeof(element_type); }
constexpr bool empty() const noexcept { return size() == 0; }
// [span.elem], span element access
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr reference operator[](size_type idx) const noexcept
{
Expects(idx < size());
return data()[idx];
}
constexpr reference front() const noexcept
{
Expects(size() > 0);
return data()[0];
}
constexpr reference back() const noexcept
{
Expects(size() > 0);
return data()[size() - 1];
}
constexpr pointer data() const noexcept { return storage_.data(); }
// [span.iter], span iterator support
constexpr iterator begin() const noexcept
{
const auto data = storage_.data();
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
return {data, data + size(), data};
}
constexpr iterator end() const noexcept
{
const auto data = storage_.data();
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
const auto endData = data + storage_.size();
return {data, endData, endData};
}
constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator{end()}; }
constexpr reverse_iterator rend() const noexcept { return reverse_iterator{begin()}; }
#ifdef _MSC_VER
// Tell MSVC how to unwrap spans in range-based-for
constexpr pointer _Unchecked_begin() const noexcept { return data(); }
constexpr pointer _Unchecked_end() const noexcept
{
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
return data() + size();
}
#endif // _MSC_VER
private:
// Needed to remove unnecessary null check in subspans
struct KnownNotNull
{
pointer p;
};
// this implementation detail class lets us take advantage of the
// empty base class optimization to pay for only storage of a single
// pointer in the case of fixed-size spans
template <class ExtentType>
class storage_type : public ExtentType
{
public:
// KnownNotNull parameter is needed to remove unnecessary null check
// in subspans and constructors from arrays
template <class OtherExtentType>
constexpr storage_type(KnownNotNull data, OtherExtentType ext)
: ExtentType(ext), data_(data.p)
{}
template <class OtherExtentType>
constexpr storage_type(pointer data, OtherExtentType ext) : ExtentType(ext), data_(data)
{
Expects(data || ExtentType::size() == 0);
}
constexpr pointer data() const noexcept { return data_; }
private:
pointer data_;
};
storage_type<details::extent_type<Extent>> storage_;
// The rest is needed to remove unnecessary null check
// in subspans and constructors from arrays
constexpr span(KnownNotNull ptr, size_type count) noexcept : storage_(ptr, count) {}
template <std::size_t CallerExtent>
class subspan_selector
{
};
template <std::size_t CallerExtent>
constexpr span<element_type, dynamic_extent>
make_subspan(size_type offset, size_type count, subspan_selector<CallerExtent>) const noexcept
{
const span<element_type, dynamic_extent> tmp(*this);
return tmp.subspan(offset, count);
}
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr span<element_type, dynamic_extent>
make_subspan(size_type offset, size_type count, subspan_selector<dynamic_extent>) const noexcept
{
Expects(size() >= offset);
if (count == dynamic_extent) { return {KnownNotNull{data() + offset}, size() - offset}; }
Expects(size() - offset >= count);
return {KnownNotNull{data() + offset}, count};
}
};
#if (defined(__cpp_deduction_guides) && (__cpp_deduction_guides >= 201611L))
// Deduction Guides
template <class Type, std::size_t Extent>
span(Type (&)[Extent]) -> span<Type, Extent>;
template <class Type, std::size_t Size>
span(std::array<Type, Size>&) -> span<Type, Size>;
template <class Type, std::size_t Size>
span(const std::array<Type, Size>&) -> span<const Type, Size>;
template <class Container,
class Element = std::remove_pointer_t<decltype(std::declval<Container&>().data())>>
span(Container&) -> span<Element>;
template <class Container,
class Element = std::remove_pointer_t<decltype(std::declval<const Container&>().data())>>
span(const Container&) -> span<Element>;
#endif // ( defined(__cpp_deduction_guides) && (__cpp_deduction_guides >= 201611L) )
#if defined(GSL_USE_STATIC_CONSTEXPR_WORKAROUND)
#if defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated" // Bug in clang-cl.exe which raises a C++17 -Wdeprecated warning about this static constexpr workaround in C++14 mode.
#endif // defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
template <class ElementType, std::size_t Extent>
constexpr const typename span<ElementType, Extent>::size_type span<ElementType, Extent>::extent;
#if defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
#pragma clang diagnostic pop
#endif // defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
#endif
namespace details
{
// if we only supported compilers with good constexpr support then
// this pair of classes could collapse down to a constexpr function
// we should use a narrow_cast<> to go to std::size_t, but older compilers may not see it as
// constexpr
// and so will fail compilation of the template
template <class ElementType, std::size_t Extent>
struct calculate_byte_size : std::integral_constant<std::size_t, sizeof(ElementType) * Extent>
{
static_assert(Extent < dynamic_extent / sizeof(ElementType), "Size is too big.");
};
template <class ElementType>
struct calculate_byte_size<ElementType, dynamic_extent>
: std::integral_constant<std::size_t, dynamic_extent>
{
};
} // namespace details
// [span.objectrep], views of object representation
template <class ElementType, std::size_t Extent>
span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
as_bytes(span<ElementType, Extent> s) noexcept
{
using type = span<const byte, details::calculate_byte_size<ElementType, Extent>::value>;
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return type{reinterpret_cast<const byte*>(s.data()), s.size_bytes()};
}
template <class ElementType, std::size_t Extent,
std::enable_if_t<!std::is_const<ElementType>::value, int> = 0>
span<byte, details::calculate_byte_size<ElementType, Extent>::value>
as_writable_bytes(span<ElementType, Extent> s) noexcept
{
using type = span<byte, details::calculate_byte_size<ElementType, Extent>::value>;
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return type{reinterpret_cast<byte*>(s.data()), s.size_bytes()};
}
} // namespace gsl
#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(pop)
#endif // _MSC_VER
#if defined(__GNUC__) && __GNUC__ > 6
#pragma GCC diagnostic pop
#endif // __GNUC__ > 6
#if defined(__clang__)
#if __has_warning("-Wunsafe-buffer-usage")
#pragma clang diagnostic pop
#endif // __has_warning("-Wunsafe-buffer-usage")
#endif // defined(__clang__)
#endif // GSL_SPAN_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_SPAN_EXT_H
#define GSL_SPAN_EXT_H
///////////////////////////////////////////////////////////////////////////////
//
// File: span_ext
// Purpose: continue offering features that have been cut from the official
// implementation of span.
// While modernizing gsl::span a number of features needed to be removed to
// be compliant with the design of std::span
//
///////////////////////////////////////////////////////////////////////////////
#include "assert" // GSL_KERNEL_MODE
#include "util" // for narrow_cast, narrow
#include <cstddef> // for ptrdiff_t, size_t
#include <utility>
#ifndef GSL_KERNEL_MODE
#include <algorithm> // for lexicographical_compare
#endif // GSL_KERNEL_MODE
namespace gsl
{
// [span.views.constants], constants
GSL_INLINE constexpr const std::size_t dynamic_extent = narrow_cast<std::size_t>(-1);
template <class ElementType, std::size_t Extent = dynamic_extent>
class span;
// std::equal and std::lexicographical_compare are not /kernel compatible
// so all comparison operators must be removed for kernel mode.
#ifndef GSL_KERNEL_MODE
// [span.comparison], span comparison operators
template <class ElementType, std::size_t FirstExtent, std::size_t SecondExtent>
constexpr bool operator==(span<ElementType, FirstExtent> l, span<ElementType, SecondExtent> r)
{
return std::equal(l.begin(), l.end(), r.begin(), r.end());
}
template <class ElementType, std::size_t Extent>
constexpr bool operator!=(span<ElementType, Extent> l, span<ElementType, Extent> r)
{
return !(l == r);
}
template <class ElementType, std::size_t Extent>
constexpr bool operator<(span<ElementType, Extent> l, span<ElementType, Extent> r)
{
return std::lexicographical_compare(l.begin(), l.end(), r.begin(), r.end());
}
template <class ElementType, std::size_t Extent>
constexpr bool operator<=(span<ElementType, Extent> l, span<ElementType, Extent> r)
{
return !(l > r);
}
template <class ElementType, std::size_t Extent>
constexpr bool operator>(span<ElementType, Extent> l, span<ElementType, Extent> r)
{
return r < l;
}
template <class ElementType, std::size_t Extent>
constexpr bool operator>=(span<ElementType, Extent> l, span<ElementType, Extent> r)
{
return !(l < r);
}
#endif // GSL_KERNEL_MODE
//
// make_span() - Utility functions for creating spans
//
template <class ElementType>
constexpr span<ElementType> make_span(ElementType* ptr, typename span<ElementType>::size_type count)
{
return span<ElementType>(ptr, count);
}
template <class ElementType>
constexpr span<ElementType> make_span(ElementType* firstElem, ElementType* lastElem)
{
return span<ElementType>(firstElem, lastElem);
}
template <class ElementType, std::size_t N>
constexpr span<ElementType, N> make_span(ElementType (&arr)[N]) noexcept
{
return span<ElementType, N>(arr);
}
template <class Container>
constexpr span<typename Container::value_type> make_span(Container& cont)
{
return span<typename Container::value_type>(cont);
}
template <class Container>
constexpr span<const typename Container::value_type> make_span(const Container& cont)
{
return span<const typename Container::value_type>(cont);
}
template <class Ptr>
[[deprecated("This function is deprecated. See GSL issue #1092.")]]
constexpr span<typename Ptr::element_type> make_span(Ptr& cont, std::size_t count)
{
return span<typename Ptr::element_type>(cont, count);
}
template <class Ptr>
[[deprecated("This function is deprecated. See GSL issue #1092.")]]
constexpr span<typename Ptr::element_type> make_span(Ptr& cont)
{
return span<typename Ptr::element_type>(cont);
}
// Specialization of gsl::at for span
template <class ElementType, std::size_t Extent>
constexpr ElementType& at(span<ElementType, Extent> s, index i)
{
// No bounds checking here because it is done in span::operator[] called below
Ensures(i >= 0);
return s[narrow_cast<std::size_t>(i)];
}
// [span.obs] Free observer functions
template <class ElementType, std::size_t Extent>
constexpr std::ptrdiff_t ssize(const span<ElementType, Extent>& s) noexcept
{
return static_cast<std::ptrdiff_t>(s.size());
}
// [span.iter] Free functions for begin/end functions
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::iterator
begin(const span<ElementType, Extent>& s) noexcept
{
return s.begin();
}
template <class ElementType, std::size_t Extent = dynamic_extent>
constexpr typename span<ElementType, Extent>::iterator
end(const span<ElementType, Extent>& s) noexcept
{
return s.end();
}
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
rbegin(const span<ElementType, Extent>& s) noexcept
{
return s.rbegin();
}
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
rend(const span<ElementType, Extent>& s) noexcept
{
return s.rend();
}
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::iterator
cbegin(const span<ElementType, Extent>& s) noexcept
{
return s.begin();
}
template <class ElementType, std::size_t Extent = dynamic_extent>
constexpr typename span<ElementType, Extent>::iterator
cend(const span<ElementType, Extent>& s) noexcept
{
return s.end();
}
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
crbegin(const span<ElementType, Extent>& s) noexcept
{
return s.rbegin();
}
template <class ElementType, std::size_t Extent>
constexpr typename span<ElementType, Extent>::reverse_iterator
crend(const span<ElementType, Extent>& s) noexcept
{
return s.rend();
}
} // namespace gsl
#endif // GSL_SPAN_EXT_H

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#pragma once
#pragma message( \
"This header will soon be removed. Use <gsl/zstring> instead of <gsl/string_span>")
#include "zstring"

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_UTIL_H
#define GSL_UTIL_H
#include "assert" // for Expects
#include <array>
#include <cstddef> // for ptrdiff_t, size_t
#include <limits> // for numeric_limits
#include <initializer_list> // for initializer_list
#include <type_traits> // for is_signed, integral_constant
#include <utility> // for exchange, forward
#if defined(__has_include) && __has_include(<version>)
#include <version>
#if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
#include <span>
#endif // __cpp_lib_span >= 202002L
#endif //__has_include(<version>)
#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(push)
#pragma warning(disable : 4127) // conditional expression is constant
#endif // _MSC_VER
// Turn off clang unsafe buffer warnings as all accessed are guarded by runtime checks
#if defined(__clang__)
#if __has_warning("-Wunsafe-buffer-usage")
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
#endif // __has_warning("-Wunsafe-buffer-usage")
#endif // defined(__clang__)
#if defined(__cplusplus) && (__cplusplus >= 201703L)
#define GSL_NODISCARD [[nodiscard]]
#else
#define GSL_NODISCARD
#endif // defined(__cplusplus) && (__cplusplus >= 201703L)
#if defined(__cpp_inline_variables)
#define GSL_INLINE inline
#else
#define GSL_INLINE
#endif
namespace gsl
{
//
// GSL.util: utilities
//
// index type for all container indexes/subscripts/sizes
using index = std::ptrdiff_t;
// final_action allows you to ensure something gets run at the end of a scope
template <class F>
class final_action
{
public:
explicit final_action(const F& ff) noexcept : f{ff} { }
explicit final_action(F&& ff) noexcept : f{std::move(ff)} { }
~final_action() noexcept { if (invoke) f(); }
final_action(final_action&& other) noexcept
: f(std::move(other.f)), invoke(std::exchange(other.invoke, false))
{ }
final_action(const final_action&) = delete;
void operator=(const final_action&) = delete;
void operator=(final_action&&) = delete;
private:
F f;
bool invoke = true;
};
// finally() - convenience function to generate a final_action
template <class F>
GSL_NODISCARD auto finally(F&& f) noexcept
{
return final_action<std::decay_t<F>>{std::forward<F>(f)};
}
// narrow_cast(): a searchable way to do narrowing casts of values
template <class T, class U>
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
constexpr T narrow_cast(U&& u) noexcept
{
return static_cast<T>(std::forward<U>(u));
}
//
// at() - Bounds-checked way of accessing builtin arrays, std::array, std::vector
//
template <class T, std::size_t N>
// clang-format off
GSL_SUPPRESS(bounds.4) // NO-FORMAT: attribute
GSL_SUPPRESS(bounds.2) // NO-FORMAT: attribute
// clang-format on
constexpr T& at(T (&arr)[N], const index i)
{
static_assert(N <= static_cast<std::size_t>((std::numeric_limits<std::ptrdiff_t>::max)()), "We only support arrays up to PTRDIFF_MAX bytes.");
Expects(i >= 0 && i < narrow_cast<index>(N));
return arr[narrow_cast<std::size_t>(i)];
}
template <class Cont>
// clang-format off
GSL_SUPPRESS(bounds.4) // NO-FORMAT: attribute
GSL_SUPPRESS(bounds.2) // NO-FORMAT: attribute
// clang-format on
constexpr auto at(Cont& cont, const index i) -> decltype(cont[cont.size()])
{
Expects(i >= 0 && i < narrow_cast<index>(cont.size()));
using size_type = decltype(cont.size());
return cont[narrow_cast<size_type>(i)];
}
template <class T>
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr T at(const std::initializer_list<T> cont, const index i)
{
Expects(i >= 0 && i < narrow_cast<index>(cont.size()));
return *(cont.begin() + i);
}
#if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
template <class T, std::size_t extent = std::dynamic_extent>
constexpr auto at(std::span<T, extent> sp, const index i) -> decltype(sp[sp.size()])
{
Expects(i >= 0 && i < narrow_cast<index>(sp.size()));
return sp[gsl::narrow_cast<std::size_t>(i)];
}
#endif // __cpp_lib_span >= 202002L
} // namespace gsl
#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(pop)
#endif // _MSC_VER
#if defined(__clang__)
#if __has_warning("-Wunsafe-buffer-usage")
#pragma clang diagnostic pop
#endif // __has_warning("-Wunsafe-buffer-usage")
#endif // defined(__clang__)
#endif // GSL_UTIL_H

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef GSL_ZSTRING_H
#define GSL_ZSTRING_H
#include "span_ext" // for dynamic_extent
#include <cstddef> // for size_t, nullptr_t
namespace gsl
{
//
// czstring and wzstring
//
// These are "tag" typedefs for C-style strings (i.e. null-terminated character arrays)
// that allow static analysis to help find bugs.
//
// There are no additional features/semantics that we can find a way to add inside the
// type system for these types that will not either incur significant runtime costs or
// (sometimes needlessly) break existing programs when introduced.
//
template <typename CharT, std::size_t Extent = dynamic_extent>
using basic_zstring = CharT*;
using czstring = basic_zstring<const char, dynamic_extent>;
using cwzstring = basic_zstring<const wchar_t, dynamic_extent>;
using cu16zstring = basic_zstring<const char16_t, dynamic_extent>;
using cu32zstring = basic_zstring<const char32_t, dynamic_extent>;
using zstring = basic_zstring<char, dynamic_extent>;
using wzstring = basic_zstring<wchar_t, dynamic_extent>;
using u16zstring = basic_zstring<char16_t, dynamic_extent>;
using u32zstring = basic_zstring<char32_t, dynamic_extent>;
} // namespace gsl
#endif // GSL_ZSTRING_H

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cmake_minimum_required(VERSION 3.14...3.16)
project(GSLTests LANGUAGES CXX)
set(GSL_CXX_STANDARD "14" CACHE STRING "Use c++ standard")
set(CMAKE_CXX_STANDARD ${GSL_CXX_STANDARD})
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
include(FindPkgConfig)
include(ExternalProject)
# will make visual studio generated project group files
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
if(CI_TESTING AND GSL_CXX_STANDARD EQUAL 20)
add_compile_definitions(FORCE_STD_SPAN_TESTS=1)
endif()
if(IOS)
add_compile_definitions(GTEST_HAS_DEATH_TEST=1 IOS_PROCESS_DELAY_WORKAROUND=1)
endif()
pkg_search_module(GTestMain gtest_main)
if (NOT GTestMain_FOUND)
# No pre-installed GTest is available, try to download it using Git.
find_package(Git REQUIRED QUIET)
configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
execute_process(
COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
)
if(result)
message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
execute_process(
COMMAND ${CMAKE_COMMAND} --build .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download
)
if(result)
message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
set(GTestMain_LIBRARIES gtest_main)
add_subdirectory(
${CMAKE_CURRENT_BINARY_DIR}/googletest-src
${CMAKE_CURRENT_BINARY_DIR}/googletest-build
EXCLUDE_FROM_ALL
)
endif()
if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
find_package(Microsoft.GSL CONFIG REQUIRED)
enable_testing()
if (NOT DEFINED Microsoft.GSL_VERSION)
message(FATAL_ERROR "Microsoft.GSL_VERSION not defined!")
endif()
message(STATUS "Microsoft.GSL_VERSION = ${Microsoft.GSL_VERSION}")
endif()
if (MSVC AND (GSL_CXX_STANDARD GREATER_EQUAL 17))
set(GSL_CPLUSPLUS_OPT -Zc:__cplusplus -permissive-)
endif()
include(CheckCXXCompilerFlag)
# this interface adds compile options to how the tests are run
# please try to keep entries ordered =)
add_library(gsl_tests_config INTERFACE)
if(MSVC) # MSVC or simulating MSVC
target_compile_options(gsl_tests_config INTERFACE
${GSL_CPLUSPLUS_OPT}
/EHsc
/W4
/WX
$<$<CXX_COMPILER_ID:MSVC>:
/wd4996 # Use of function or classes marked [[deprecated]]
/wd26409 # CppCoreCheck - GTest
/wd26426 # CppCoreCheck - GTest
/wd26440 # CppCoreCheck - GTest
/wd26446 # CppCoreCheck - prefer gsl::at()
/wd26472 # CppCoreCheck - use gsl::narrow(_cast)
/wd26481 # CppCoreCheck - use span instead of pointer arithmetic
$<$<VERSION_LESS:$<CXX_COMPILER_VERSION>,1920>: # VS2015
/wd4189 # variable is initialized but not referenced
$<$<NOT:$<CONFIG:Debug>>: # Release, RelWithDebInfo
/wd4702 # Unreachable code
>
>
>
$<$<CXX_COMPILER_ID:Clang>:
-Weverything
-Wfloat-equal
-Wno-c++98-compat
-Wno-c++98-compat-pedantic
-Wno-covered-switch-default # GTest
-Wno-deprecated-declarations # Allow tests for [[deprecated]] elements
-Wno-global-constructors # GTest
-Wno-language-extension-token # GTest gtest-port.h
-Wno-missing-braces
-Wno-missing-prototypes
-Wno-shift-sign-overflow # GTest gtest-port.h
-Wno-undef # GTest
-Wno-used-but-marked-unused # GTest EXPECT_DEATH
$<$<EQUAL:${GSL_CXX_STANDARD},14>: # no support for [[maybe_unused]]
-Wno-unused-member-function
-Wno-unused-variable
$<$<VERSION_EQUAL:$<CXX_COMPILER_VERSION>,15.0.1>:
-Wno-deprecated # False positive in MSVC Clang 15.0.1 raises a C++17 warning
>
>
>
)
check_cxx_compiler_flag("-Wno-reserved-identifier" WARN_RESERVED_ID)
if (WARN_RESERVED_ID)
target_compile_options(gsl_tests_config INTERFACE "-Wno-reserved-identifier")
endif()
else()
target_compile_options(gsl_tests_config INTERFACE
-fno-strict-aliasing
-Wall
-Wcast-align
-Wconversion
-Wctor-dtor-privacy
-Werror
-Wextra
-Wpedantic
-Wshadow
-Wsign-conversion
-Wfloat-equal
-Wno-deprecated-declarations # Allow tests for [[deprecated]] elements
$<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
-Weverything
-Wno-c++98-compat
-Wno-c++98-compat-pedantic
-Wno-missing-braces
-Wno-covered-switch-default # GTest
-Wno-global-constructors # GTest
-Wno-missing-prototypes
-Wno-padded
-Wno-switch-default
-Wno-unknown-attributes
-Wno-used-but-marked-unused # GTest EXPECT_DEATH
-Wno-weak-vtables
$<$<EQUAL:${GSL_CXX_STANDARD},14>: # no support for [[maybe_unused]]
-Wno-unused-member-function
-Wno-unused-variable
>
>
$<$<CXX_COMPILER_ID:Clang>:
$<$<AND:$<VERSION_GREATER:$<CXX_COMPILER_VERSION>,4.99>,$<VERSION_LESS:$<CXX_COMPILER_VERSION>,6>>:
$<$<EQUAL:${GSL_CXX_STANDARD},17>:-Wno-undefined-func-template>
>
$<$<AND:$<EQUAL:${GSL_CXX_STANDARD},20>,$<OR:$<CXX_COMPILER_VERSION:11.0.0>,$<CXX_COMPILER_VERSION:10.0.0>>>:
-Wno-zero-as-null-pointer-constant # failing Clang Ubuntu 20.04 tests, seems to be a bug with clang 10.0.0
# and clang 11.0.0. (operator< is being re-written by the compiler
# as operator<=> and raising the warning)
>
>
$<$<CXX_COMPILER_ID:AppleClang>:
$<$<AND:$<VERSION_GREATER:$<CXX_COMPILER_VERSION>,9.1>,$<VERSION_LESS:$<CXX_COMPILER_VERSION>,10>>:
$<$<EQUAL:${GSL_CXX_STANDARD},17>:-Wno-undefined-func-template>
>
>
$<$<CXX_COMPILER_ID:GNU>:
-Wdouble-promotion # float implicit to double
-Wlogical-op # suspicious uses of logical operators
$<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,6>>:
-Wduplicated-cond # duplicated if-else conditions
-Wmisleading-indentation
-Wnull-dereference
$<$<EQUAL:${GSL_CXX_STANDARD},14>: # no support for [[maybe_unused]]
-Wno-unused-variable
>
>
$<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,7>>:
-Wduplicated-branches # identical if-else branches
>
>
)
endif(MSVC)
check_cxx_compiler_flag("-Wno-unsafe-buffer-usage" WARN_UNSAFE_BUFFER)
if (WARN_UNSAFE_BUFFER)
# This test uses very greedy heuristics such as "no pointer arithmetic on raw buffer"
target_compile_options(gsl_tests_config INTERFACE "-Wno-unsafe-buffer-usage")
endif()
# for tests to find the gtest header
target_include_directories(gsl_tests_config SYSTEM INTERFACE
googletest/googletest/include
)
add_executable(gsl_tests
algorithm_tests.cpp
assertion_tests.cpp
at_tests.cpp
byte_tests.cpp
notnull_tests.cpp
owner_tests.cpp
span_compatibility_tests.cpp
span_ext_tests.cpp
span_tests.cpp
strict_notnull_tests.cpp
utils_tests.cpp
)
target_link_libraries(gsl_tests
Microsoft.GSL::GSL
gsl_tests_config
${GTestMain_LIBRARIES}
)
add_test(gsl_tests gsl_tests)
# No exception tests
foreach(flag_var
CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
STRING (REGEX REPLACE "/EHsc" "" ${flag_var} "${${flag_var}}")
endforeach(flag_var)
# this interface adds compile options to how the tests are run
# please try to keep entries ordered =)
add_library(gsl_tests_config_noexcept INTERFACE)
if(MSVC) # MSVC or simulating MSVC
target_compile_definitions(gsl_tests_config_noexcept INTERFACE
_HAS_EXCEPTIONS=0 # disable exceptions in the Microsoft STL
)
target_compile_options(gsl_tests_config_noexcept INTERFACE
${GSL_CPLUSPLUS_OPT}
/W4
/WX
$<$<CXX_COMPILER_ID:MSVC>:
/wd4577
/wd4702
/wd26440 # CppCoreCheck - GTest
/wd26446 # CppCoreCheck - prefer gsl::at()
>
$<$<CXX_COMPILER_ID:Clang>:
-Weverything
-Wfloat-equal
-Wno-c++98-compat
-Wno-c++98-compat-pedantic
-Wno-missing-prototypes
-Wno-unknown-attributes
$<$<EQUAL:${GSL_CXX_STANDARD},14>:
$<$<VERSION_EQUAL:$<CXX_COMPILER_VERSION>,15.0.1>:
-Wno-deprecated # False positive in MSVC Clang 15.0.1 raises a C++17 warning
>
>
>
)
check_cxx_compiler_flag("-Wno-reserved-identifier" WARN_RESERVED_ID)
if (WARN_RESERVED_ID)
target_compile_options(gsl_tests_config_noexcept INTERFACE "-Wno-reserved-identifier")
endif()
else()
target_compile_options(gsl_tests_config_noexcept INTERFACE
-fno-exceptions
-fno-strict-aliasing
-Wall
-Wcast-align
-Wconversion
-Wctor-dtor-privacy
-Werror
-Wextra
-Wpedantic
-Wshadow
-Wsign-conversion
-Wfloat-equal
$<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
-Weverything
-Wno-c++98-compat
-Wno-c++98-compat-pedantic
-Wno-missing-prototypes
-Wno-unknown-attributes
-Wno-weak-vtables
>
$<$<CXX_COMPILER_ID:GNU>:
-Wdouble-promotion # float implicit to double
-Wlogical-op # suspicious uses of logical operators
-Wuseless-cast # casting to its own type
$<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,6>>:
-Wduplicated-cond # duplicated if-else conditions
-Wmisleading-indentation
-Wnull-dereference
>
$<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,7>>:
-Wduplicated-branches # identical if-else branches
>
$<$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,8>>:
-Wcast-align=strict # increase alignment (i.e. char* to int*)
>
>
)
endif(MSVC)
check_cxx_compiler_flag("-Wno-unsafe-buffer-usage" WARN_UNSAFE_BUFFER)
if (WARN_UNSAFE_BUFFER)
# This test uses very greedy heuristics such as "no pointer arithmetic on raw buffer"
target_compile_options(gsl_tests_config_noexcept INTERFACE "-Wno-unsafe-buffer-usage")
endif()
add_executable(gsl_noexcept_tests no_exception_ensure_tests.cpp)
target_link_libraries(gsl_noexcept_tests
Microsoft.GSL::GSL
gsl_tests_config_noexcept
)
add_test(gsl_noexcept_tests gsl_noexcept_tests)

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cmake_minimum_required(VERSION 3.0.2)
project(googletest-download NONE)
include(ExternalProject)
ExternalProject_Add(googletest
GIT_REPOSITORY https://github.com/google/googletest.git
GIT_TAG 1b18723e874b256c1e39378c6774a90701d70f7a
SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/googletest-src"
BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/googletest-build"
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
INSTALL_COMMAND ""
TEST_COMMAND ""
)

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <array> // for array
#include <cstddef> // for size_t
#include <gsl/algorithm> // for copy
#include <gsl/span> // for span
#include <gtest/gtest.h>
#include "deathTestCommon.h"
namespace gsl
{
struct fail_fast;
} // namespace gsl
using namespace gsl;
TEST(algorithm_tests, same_type)
{
// dynamic source and destination span
{
std::array<int, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<int> src_span(src);
const span<int> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
// static source and dynamic destination span
{
std::array<int, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<int, 5> src_span(src);
const span<int> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
// dynamic source and static destination span
{
std::array<int, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const gsl::span<int> src_span(src);
const gsl::span<int, 10> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
// static source and destination span
{
std::array<int, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<int, 5> src_span(src);
const span<int, 10> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
}
TEST(algorithm_tests, compatible_type)
{
// dynamic source and destination span
{
std::array<short, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<short> src_span(src);
const span<int> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
// static source and dynamic destination span
{
std::array<short, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<short, 5> src_span(src);
const span<int> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
// dynamic source and static destination span
{
std::array<short, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<short> src_span(src);
const span<int, 10> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
// static source and destination span
{
std::array<short, 5> src{1, 2, 3, 4, 5};
std::array<int, 10> dst{};
const span<short, 5> src_span(src);
const span<int, 10> dst_span(dst);
copy(src_span, dst_span);
copy(src_span, dst_span.subspan(src_span.size()));
for (std::size_t i = 0; i < src.size(); ++i)
{
EXPECT_TRUE(dst[i] == src[i]);
EXPECT_TRUE(dst[i + src.size()] == src[i]);
}
}
}
#ifdef CONFIRM_COMPILATION_ERRORS
TEST(algorithm_tests, incompatible_type)
{
std::array<int, 4> src{1, 2, 3, 4};
std::array<int*, 12> dst{};
span<int> src_span_dyn(src);
span<int, 4> src_span_static(src);
span<int*> dst_span_dyn(dst);
span<int*, 4> dst_span_static(dst);
// every line should produce a compilation error
copy(src_span_dyn, dst_span_dyn);
copy(src_span_dyn, dst_span_static);
copy(src_span_static, dst_span_dyn);
copy(src_span_static, dst_span_static);
}
#endif
TEST(algorithm_tests, small_destination_span)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. small_destination_span";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
std::array<int, 12> src{1, 2, 3, 4};
std::array<int, 4> dst{};
const span<int> src_span_dyn(src);
const span<int, 12> src_span_static(src);
const span<int> dst_span_dyn(dst);
const span<int, 4> dst_span_static(dst);
EXPECT_DEATH(copy(src_span_dyn, dst_span_dyn), expected);
EXPECT_DEATH(copy(src_span_dyn, dst_span_static), expected);
EXPECT_DEATH(copy(src_span_static, dst_span_dyn), expected);
#ifdef CONFIRM_COMPILATION_ERRORS
copy(src_span_static, dst_span_static);
#endif
}

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include "deathTestCommon.h"
#include <gsl/assert> // for Ensures, Expects
#include <gtest/gtest.h>
using namespace gsl;
namespace
{
int f(int i)
{
Expects(i > 0 && i < 10);
return i;
}
int g(int i)
{
i++;
Ensures(i > 0 && i < 10);
return i;
}
} // namespace
TEST(assertion_tests, expects)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. expects";
std::abort();
});
EXPECT_TRUE(f(2) == 2);
EXPECT_DEATH(f(10), GetExpectedDeathString(terminateHandler));
}
TEST(assertion_tests, ensures)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. ensures";
std::abort();
});
EXPECT_TRUE(g(2) == 3);
EXPECT_DEATH(g(9), GetExpectedDeathString(terminateHandler));
}

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gtest/gtest.h>
#include <gsl/util> // for at
#include <array> // for array
#include <cstddef> // for size_t
#include <exception> // for terminate
#include <initializer_list> // for initializer_list
#include <vector> // for vector
#if defined(__cplusplus) && __cplusplus >= 202002L
#include <span>
#endif // __cplusplus >= 202002L
#include "deathTestCommon.h"
TEST(at_tests, static_array)
{
int a[4] = {1, 2, 3, 4};
const int(&c_a)[4] = a;
for (int i = 0; i < 4; ++i)
{
EXPECT_TRUE(&gsl::at(a, i) == &a[i]);
EXPECT_TRUE(&gsl::at(c_a, i) == &a[i]);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. static_array";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
EXPECT_DEATH(gsl::at(a, -1), expected);
EXPECT_DEATH(gsl::at(a, 4), expected);
EXPECT_DEATH(gsl::at(c_a, -1), expected);
EXPECT_DEATH(gsl::at(c_a, 4), expected);
}
TEST(at_tests, std_array)
{
std::array<int, 4> a = {1, 2, 3, 4};
const std::array<int, 4>& c_a = a;
for (int i = 0; i < 4; ++i)
{
EXPECT_TRUE(&gsl::at(a, i) == &a[static_cast<std::size_t>(i)]);
EXPECT_TRUE(&gsl::at(c_a, i) == &a[static_cast<std::size_t>(i)]);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. std_array";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
EXPECT_DEATH(gsl::at(a, -1), expected);
EXPECT_DEATH(gsl::at(a, 4), expected);
EXPECT_DEATH(gsl::at(c_a, -1), expected);
EXPECT_DEATH(gsl::at(c_a, 4), expected);
}
TEST(at_tests, std_vector)
{
std::vector<int> a = {1, 2, 3, 4};
const std::vector<int>& c_a = a;
for (int i = 0; i < 4; ++i)
{
EXPECT_TRUE(&gsl::at(a, i) == &a[static_cast<std::size_t>(i)]);
EXPECT_TRUE(&gsl::at(c_a, i) == &a[static_cast<std::size_t>(i)]);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. std_vector";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
EXPECT_DEATH(gsl::at(a, -1), expected);
EXPECT_DEATH(gsl::at(a, 4), expected);
EXPECT_DEATH(gsl::at(c_a, -1), expected);
EXPECT_DEATH(gsl::at(c_a, 4), expected);
}
TEST(at_tests, InitializerList)
{
const std::initializer_list<int> a = {1, 2, 3, 4};
for (int i = 0; i < 4; ++i)
{
EXPECT_TRUE(gsl::at(a, i) == i + 1);
EXPECT_TRUE(gsl::at({1, 2, 3, 4}, i) == i + 1);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. InitializerList";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
EXPECT_DEATH(gsl::at(a, -1), expected);
EXPECT_DEATH(gsl::at(a, 4), expected);
EXPECT_DEATH(gsl::at({1, 2, 3, 4}, -1), expected);
EXPECT_DEATH(gsl::at({1, 2, 3, 4}, 4), expected);
}
#if defined(FORCE_STD_SPAN_TESTS) || defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
TEST(at_tests, std_span)
{
std::vector<int> vec{1, 2, 3, 4, 5};
std::span sp{vec};
std::vector<int> cvec{1, 2, 3, 4, 5};
std::span csp{cvec};
for (gsl::index i = 0; i < gsl::narrow_cast<gsl::index>(vec.size()); ++i)
{
EXPECT_TRUE(&gsl::at(sp, i) == &vec[gsl::narrow_cast<size_t>(i)]);
EXPECT_TRUE(&gsl::at(csp, i) == &cvec[gsl::narrow_cast<size_t>(i)]);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. std_span";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
EXPECT_DEATH(gsl::at(sp, -1), expected);
EXPECT_DEATH(gsl::at(sp, gsl::narrow_cast<gsl::index>(sp.size())), expected);
EXPECT_DEATH(gsl::at(csp, -1), expected);
EXPECT_DEATH(gsl::at(csp, gsl::narrow_cast<gsl::index>(sp.size())), expected);
}
#endif // defined(FORCE_STD_SPAN_TESTS) || defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
#if !defined(_MSC_VER) || defined(__clang__) || _MSC_VER >= 1910
static constexpr bool test_constexpr()
{
int a1[4] = {1, 2, 3, 4};
const int(&c_a1)[4] = a1;
std::array<int, 4> a2 = {1, 2, 3, 4};
const std::array<int, 4>& c_a2 = a2;
for (int i = 0; i < 4; ++i)
{
if (&gsl::at(a1, i) != &a1[i]) return false;
if (&gsl::at(c_a1, i) != &a1[i]) return false;
// requires C++17:
// if (&gsl::at(a2, i) != &a2[static_cast<std::size_t>(i)]) return false;
if (&gsl::at(c_a2, i) != &c_a2[static_cast<std::size_t>(i)]) return false;
if (gsl::at({1, 2, 3, 4}, i) != i + 1) return false;
}
return true;
}
static_assert(test_constexpr(), "FAIL");
#endif

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gtest/gtest.h>
#include <gsl/byte> // for to_byte, to_integer, byte, operator&, ope...
using namespace std;
using namespace gsl;
namespace
{
int modify_both(gsl::byte& b, int& i)
{
i = 10;
b = to_byte<5>();
return i;
}
TEST(byte_tests, construction)
{
{
const byte b = static_cast<byte>(4);
EXPECT_TRUE(static_cast<unsigned char>(b) == 4);
}
{
const byte b = byte(12);
EXPECT_TRUE(static_cast<unsigned char>(b) == 12);
}
{
const byte b = to_byte<12>();
EXPECT_TRUE(static_cast<unsigned char>(b) == 12);
}
{
const unsigned char uc = 12;
const byte b = to_byte(uc);
EXPECT_TRUE(static_cast<unsigned char>(b) == 12);
}
#if defined(__cplusplus) && (__cplusplus >= 201703L)
{
const byte b{14};
EXPECT_TRUE(static_cast<unsigned char>(b) == 14);
}
#endif
#ifdef CONFIRM_COMPILATION_ERRORS
to_byte(char{});
to_byte(3);
to_byte(3u);
#endif
}
TEST(byte_tests, bitwise_operations)
{
const byte b = to_byte<0xFF>();
byte a = to_byte<0x00>();
EXPECT_TRUE((b | a) == to_byte<0xFF>());
EXPECT_TRUE(a == to_byte<0x00>());
a |= b;
EXPECT_TRUE(a == to_byte<0xFF>());
a = to_byte<0x01>();
EXPECT_TRUE((b & a) == to_byte<0x01>());
a &= b;
EXPECT_TRUE(a == to_byte<0x01>());
EXPECT_TRUE((b ^ a) == to_byte<0xFE>());
EXPECT_TRUE(a == to_byte<0x01>());
a ^= b;
EXPECT_TRUE(a == to_byte<0xFE>());
a = to_byte<0x01>();
EXPECT_TRUE(~a == to_byte<0xFE>());
a = to_byte<0xFF>();
EXPECT_TRUE((a << 4) == to_byte<0xF0>());
EXPECT_TRUE((a >> 4) == to_byte<0x0F>());
a <<= 4;
EXPECT_TRUE(a == to_byte<0xF0>());
a >>= 4;
EXPECT_TRUE(a == to_byte<0x0F>());
}
TEST(byte_tests, to_integer)
{
const byte b = to_byte<0x12>();
EXPECT_TRUE(0x12 == gsl::to_integer<char>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<short>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<long>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<long long>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<unsigned char>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<unsigned short>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<unsigned long>(b));
EXPECT_TRUE(0x12 == gsl::to_integer<unsigned long long>(b));
// EXPECT_TRUE(0x12 == gsl::to_integer<float>(b)); // expect compile-time error
// EXPECT_TRUE(0x12 == gsl::to_integer<double>(b)); // expect compile-time error
}
TEST(byte_tests, aliasing)
{
int i{0};
const int res = modify_both(reinterpret_cast<byte&>(i), i);
EXPECT_TRUE(res == i);
}
} // namespace
#ifdef CONFIRM_COMPILATION_ERRORS
copy(src_span_static, dst_span_static);
#endif

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#pragma once
#include <gsl/assert>
constexpr char deathstring[] = "Expected Death";
constexpr char failed_set_terminate_deathstring[] = ".*";
// This prevents a failed call to set_terminate from failing the test suite.
constexpr const char* GetExpectedDeathString(std::terminate_handler handle)
{
return handle ? deathstring : failed_set_terminate_deathstring;
}

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <chrono>
#include <cstdlib> // for std::exit
#include <gsl/span> // for span
#include <iostream>
#include <thread>
int operator_subscript_no_throw() noexcept
{
int arr[10];
const gsl::span<int> sp{arr};
return sp[11];
}
[[noreturn]] void test_terminate() { std::exit(0); }
void setup_termination_handler() noexcept
{
#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND)
auto& handler = gsl::details::get_terminate_handler();
handler = &test_terminate;
#else
std::set_terminate(test_terminate);
#endif
}
int main() noexcept
{
std::cout << "Running main() from " __FILE__ "\n";
#if defined(IOS_PROCESS_DELAY_WORKAROUND)
std::this_thread::sleep_for(std::chrono::seconds(1));
#endif
setup_termination_handler();
operator_subscript_no_throw();
return -1;
}

648
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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gtest/gtest.h>
#include <gsl/pointers> // for not_null, operator<, operator<=, operator>
#include <algorithm> // for addressof
#include <cstdint> // for uint16_t
#include <memory> // for shared_ptr, make_shared, operator<, opera...
#include <sstream> // for operator<<, ostringstream, basic_ostream:...
#include <string> // for basic_string, operator==, string, operator<<
#include <typeinfo> // for type_info
#include <variant> // for variant, monostate, get
#include "deathTestCommon.h"
using namespace gsl;
struct MyBase
{
};
struct MyDerived : public MyBase
{
};
struct Unrelated
{
};
// stand-in for a user-defined ref-counted class
template <typename T>
struct RefCounted
{
RefCounted(T* p) : p_(p) {}
operator T*() { return p_; }
T* p_;
};
// user defined smart pointer with comparison operators returning non bool value
template <typename T>
struct CustomPtr
{
CustomPtr(T* p) : p_(p) {}
operator T*() const { return p_; }
bool operator!=(std::nullptr_t) const { return p_ != nullptr; }
T* p_ = nullptr;
};
template <typename T, typename U>
std::string operator==(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
{
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return reinterpret_cast<const void*>(lhs.p_) == reinterpret_cast<const void*>(rhs.p_) ? "true"
: "false";
}
template <typename T, typename U>
std::string operator!=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
{
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return reinterpret_cast<const void*>(lhs.p_) != reinterpret_cast<const void*>(rhs.p_) ? "true"
: "false";
}
template <typename T, typename U>
std::string operator<(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
{
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return reinterpret_cast<const void*>(lhs.p_) < reinterpret_cast<const void*>(rhs.p_) ? "true"
: "false";
}
template <typename T, typename U>
std::string operator>(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
{
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return reinterpret_cast<const void*>(lhs.p_) > reinterpret_cast<const void*>(rhs.p_) ? "true"
: "false";
}
template <typename T, typename U>
std::string operator<=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
{
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return reinterpret_cast<const void*>(lhs.p_) <= reinterpret_cast<const void*>(rhs.p_) ? "true"
: "false";
}
template <typename T, typename U>
std::string operator>=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
{
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return reinterpret_cast<const void*>(lhs.p_) >= reinterpret_cast<const void*>(rhs.p_) ? "true"
: "false";
}
struct NonCopyableNonMovable
{
NonCopyableNonMovable() = default;
NonCopyableNonMovable(const NonCopyableNonMovable&) = delete;
NonCopyableNonMovable& operator=(const NonCopyableNonMovable&) = delete;
NonCopyableNonMovable(NonCopyableNonMovable&&) = delete;
NonCopyableNonMovable& operator=(NonCopyableNonMovable&&) = delete;
};
namespace
{
// clang-format off
GSL_SUPPRESS(f .4) // NO-FORMAT: attribute
// clang-format on
bool helper(not_null<int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f .4) // NO-FORMAT: attribute
// clang-format on
bool helper_const(not_null<const int*> p) { return *p == 12; }
int* return_pointer() { return nullptr; }
} // namespace
TEST(notnull_tests, TestNotNullConstructors)
{
{
#ifdef CONFIRM_COMPILATION_ERRORS
not_null<int*> p = nullptr; // yay...does not compile!
not_null<std::vector<char>*> p1 = 0; // yay...does not compile!
not_null<int*> p2; // yay...does not compile!
std::unique_ptr<int> up = std::make_unique<int>(120);
not_null<int*> p3 = up;
// Forbid non-nullptr assignable types
not_null<std::vector<int>> f(std::vector<int>{1});
not_null<int> z(10);
not_null<std::vector<int>> y({1, 2});
#endif
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestNotNullConstructors";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
{
// from shared pointer
int i = 12;
auto rp = RefCounted<int>(&i);
not_null<int*> p(rp);
EXPECT_TRUE(p.get() == &i);
not_null<std::shared_ptr<int>> x(
std::make_shared<int>(10)); // shared_ptr<int> is nullptr assignable
int* pi = nullptr;
EXPECT_DEATH((not_null<decltype(pi)>(pi)), expected);
}
{
// from pointer to local
int t = 42;
not_null<int*> x = &t;
helper(&t);
helper_const(&t);
EXPECT_TRUE(*x == 42);
}
{
// from raw pointer
// from not_null pointer
int t = 42;
int* p = &t;
not_null<int*> x = p;
helper(p);
helper_const(p);
helper(x);
helper_const(x);
EXPECT_TRUE(*x == 42);
}
{
// from raw const pointer
// from not_null const pointer
int t = 42;
const int* cp = &t;
not_null<const int*> x = cp;
helper_const(cp);
helper_const(x);
EXPECT_TRUE(*x == 42);
}
{
// from not_null const pointer, using auto
int t = 42;
const int* cp = &t;
auto x = not_null<const int*>{cp};
EXPECT_TRUE(*x == 42);
}
{
// from returned pointer
EXPECT_DEATH(helper(return_pointer()), expected);
EXPECT_DEATH(helper_const(return_pointer()), expected);
}
}
template <typename T>
void ostream_helper(T v)
{
not_null<T*> p(&v);
{
std::ostringstream os;
std::ostringstream ref;
os << static_cast<void*>(p);
ref << static_cast<void*>(&v);
EXPECT_TRUE(os.str() == ref.str());
}
{
std::ostringstream os;
std::ostringstream ref;
os << *p;
ref << v;
EXPECT_TRUE(os.str() == ref.str());
}
}
TEST(notnull_tests, TestNotNullostream)
{
ostream_helper<int>(17);
ostream_helper<float>(21.5f);
ostream_helper<double>(3.4566e-7);
ostream_helper<char>('c');
ostream_helper<uint16_t>(0x0123u);
ostream_helper<const char*>("cstring");
ostream_helper<std::string>("string");
}
TEST(notnull_tests, TestNotNullCasting)
{
MyBase base;
MyDerived derived;
Unrelated unrelated;
not_null<Unrelated*> u{&unrelated};
(void) u;
not_null<MyDerived*> p{&derived};
not_null<MyBase*> q(&base);
q = p; // allowed with heterogeneous copy ctor
EXPECT_TRUE(q == p);
#ifdef CONFIRM_COMPILATION_ERRORS
q = u; // no viable conversion possible between MyBase* and Unrelated*
p = q; // not possible to implicitly convert MyBase* to MyDerived*
not_null<Unrelated*> r = p;
not_null<Unrelated*> s = reinterpret_cast<Unrelated*>(p);
#endif
not_null<Unrelated*> t(reinterpret_cast<Unrelated*>(p.get()));
EXPECT_TRUE(reinterpret_cast<void*>(p.get()) == reinterpret_cast<void*>(t.get()));
}
TEST(notnull_tests, TestNotNullAssignment)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestNotNullAssignmentd";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
int i = 12;
not_null<int*> p(&i);
EXPECT_TRUE(helper(p));
int* q = nullptr;
EXPECT_DEATH(p = not_null<int*>(q), expected);
}
TEST(notnull_tests, TestNotNullRawPointerComparison)
{
int ints[2] = {42, 43};
int* p1 = &ints[0];
const int* p2 = &ints[1];
using NotNull1 = not_null<decltype(p1)>;
using NotNull2 = not_null<decltype(p2)>;
EXPECT_TRUE((NotNull1(p1) == NotNull1(p1)) == true);
EXPECT_TRUE((NotNull1(p1) == NotNull2(p2)) == false);
EXPECT_TRUE((NotNull1(p1) != NotNull1(p1)) == false);
EXPECT_TRUE((NotNull1(p1) != NotNull2(p2)) == true);
EXPECT_TRUE((NotNull1(p1) < NotNull1(p1)) == false);
EXPECT_TRUE((NotNull1(p1) < NotNull2(p2)) == (p1 < p2));
EXPECT_TRUE((NotNull2(p2) < NotNull1(p1)) == (p2 < p1));
EXPECT_TRUE((NotNull1(p1) > NotNull1(p1)) == false);
EXPECT_TRUE((NotNull1(p1) > NotNull2(p2)) == (p1 > p2));
EXPECT_TRUE((NotNull2(p2) > NotNull1(p1)) == (p2 > p1));
EXPECT_TRUE((NotNull1(p1) <= NotNull1(p1)) == true);
EXPECT_TRUE((NotNull1(p1) <= NotNull2(p2)) == (p1 <= p2));
EXPECT_TRUE((NotNull2(p2) <= NotNull1(p1)) == (p2 <= p1));
}
TEST(notnull_tests, TestNotNullDereferenceOperator)
{
{
auto sp1 = std::make_shared<NonCopyableNonMovable>();
using NotNullSp1 = not_null<decltype(sp1)>;
EXPECT_TRUE(typeid(*sp1) == typeid(*NotNullSp1(sp1)));
EXPECT_TRUE(std::addressof(*NotNullSp1(sp1)) == std::addressof(*sp1));
}
{
int ints[1] = {42};
CustomPtr<int> p1(&ints[0]);
using NotNull1 = not_null<decltype(p1)>;
EXPECT_TRUE(typeid(*NotNull1(p1)) == typeid(*p1));
EXPECT_TRUE(*NotNull1(p1) == 42);
*NotNull1(p1) = 43;
EXPECT_TRUE(ints[0] == 43);
}
{
int v = 42;
gsl::not_null<int*> p(&v);
EXPECT_TRUE(typeid(*p) == typeid(*(&v)));
*p = 43;
EXPECT_TRUE(v == 43);
}
}
TEST(notnull_tests, TestNotNullSharedPtrComparison)
{
auto sp1 = std::make_shared<int>(42);
auto sp2 = std::make_shared<const int>(43);
using NotNullSp1 = not_null<decltype(sp1)>;
using NotNullSp2 = not_null<decltype(sp2)>;
EXPECT_TRUE((NotNullSp1(sp1) == NotNullSp1(sp1)) == true);
EXPECT_TRUE((NotNullSp1(sp1) == NotNullSp2(sp2)) == false);
EXPECT_TRUE((NotNullSp1(sp1) != NotNullSp1(sp1)) == false);
EXPECT_TRUE((NotNullSp1(sp1) != NotNullSp2(sp2)) == true);
EXPECT_TRUE((NotNullSp1(sp1) < NotNullSp1(sp1)) == false);
EXPECT_TRUE((NotNullSp1(sp1) < NotNullSp2(sp2)) == (sp1 < sp2));
EXPECT_TRUE((NotNullSp2(sp2) < NotNullSp1(sp1)) == (sp2 < sp1));
EXPECT_TRUE((NotNullSp1(sp1) > NotNullSp1(sp1)) == false);
EXPECT_TRUE((NotNullSp1(sp1) > NotNullSp2(sp2)) == (sp1 > sp2));
EXPECT_TRUE((NotNullSp2(sp2) > NotNullSp1(sp1)) == (sp2 > sp1));
EXPECT_TRUE((NotNullSp1(sp1) <= NotNullSp1(sp1)) == true);
EXPECT_TRUE((NotNullSp1(sp1) <= NotNullSp2(sp2)) == (sp1 <= sp2));
EXPECT_TRUE((NotNullSp2(sp2) <= NotNullSp1(sp1)) == (sp2 <= sp1));
EXPECT_TRUE((NotNullSp1(sp1) >= NotNullSp1(sp1)) == true);
EXPECT_TRUE((NotNullSp1(sp1) >= NotNullSp2(sp2)) == (sp1 >= sp2));
EXPECT_TRUE((NotNullSp2(sp2) >= NotNullSp1(sp1)) == (sp2 >= sp1));
}
TEST(notnull_tests, TestNotNullCustomPtrComparison)
{
int ints[2] = {42, 43};
CustomPtr<int> p1(&ints[0]);
CustomPtr<const int> p2(&ints[1]);
using NotNull1 = not_null<decltype(p1)>;
using NotNull2 = not_null<decltype(p2)>;
EXPECT_TRUE((NotNull1(p1) == NotNull1(p1)) == "true");
EXPECT_TRUE((NotNull1(p1) == NotNull2(p2)) == "false");
EXPECT_TRUE((NotNull1(p1) != NotNull1(p1)) == "false");
EXPECT_TRUE((NotNull1(p1) != NotNull2(p2)) == "true");
EXPECT_TRUE((NotNull1(p1) < NotNull1(p1)) == "false");
EXPECT_TRUE((NotNull1(p1) < NotNull2(p2)) == (p1 < p2));
EXPECT_TRUE((NotNull2(p2) < NotNull1(p1)) == (p2 < p1));
EXPECT_TRUE((NotNull1(p1) > NotNull1(p1)) == "false");
EXPECT_TRUE((NotNull1(p1) > NotNull2(p2)) == (p1 > p2));
EXPECT_TRUE((NotNull2(p2) > NotNull1(p1)) == (p2 > p1));
EXPECT_TRUE((NotNull1(p1) <= NotNull1(p1)) == "true");
EXPECT_TRUE((NotNull1(p1) <= NotNull2(p2)) == (p1 <= p2));
EXPECT_TRUE((NotNull2(p2) <= NotNull1(p1)) == (p2 <= p1));
EXPECT_TRUE((NotNull1(p1) >= NotNull1(p1)) == "true");
EXPECT_TRUE((NotNull1(p1) >= NotNull2(p2)) == (p1 >= p2));
EXPECT_TRUE((NotNull2(p2) >= NotNull1(p1)) == (p2 >= p1));
}
#if defined(__cplusplus) && (__cplusplus >= 201703L)
TEST(notnull_tests, TestNotNullConstructorTypeDeduction)
{
{
int i = 42;
not_null x{&i};
helper(not_null{&i});
helper_const(not_null{&i});
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
not_null x{&i};
#ifdef CONFIRM_COMPILATION_ERRORS
helper(not_null{&i});
#endif
helper_const(not_null{&i});
EXPECT_TRUE(*x == 42);
}
{
int i = 42;
int* p = &i;
not_null x{p};
helper(not_null{p});
helper_const(not_null{p});
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
const int* p = &i;
not_null x{p};
#ifdef CONFIRM_COMPILATION_ERRORS
helper(not_null{p});
#endif
helper_const(not_null{p});
EXPECT_TRUE(*x == 42);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestNotNullConstructorTypeDeduction";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
{
auto workaround_macro = []() {
int* p1 = nullptr;
const not_null x{p1};
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
auto workaround_macro = []() {
const int* p1 = nullptr;
const not_null x{p1};
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
int* p = nullptr;
EXPECT_DEATH(helper(not_null{p}), expected);
EXPECT_DEATH(helper_const(not_null{p}), expected);
}
#ifdef CONFIRM_COMPILATION_ERRORS
{
not_null x{nullptr};
helper(not_null{nullptr});
helper_const(not_null{nullptr});
}
#endif
}
TEST(notnull_tests, TestVariantEmplace)
{
int i = 0;
std::variant<std::monostate, not_null<int*>> v;
v.emplace<not_null<int*>>(&i);
EXPECT_FALSE(v.valueless_by_exception());
EXPECT_TRUE(v.index() == 1);
EXPECT_TRUE(std::get<not_null<int*>>(v) == &i);
}
#endif // #if defined(__cplusplus) && (__cplusplus >= 201703L)
TEST(notnull_tests, TestMakeNotNull)
{
{
int i = 42;
const auto x = make_not_null(&i);
helper(make_not_null(&i));
helper_const(make_not_null(&i));
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
const auto x = make_not_null(&i);
#ifdef CONFIRM_COMPILATION_ERRORS
helper(make_not_null(&i));
#endif
helper_const(make_not_null(&i));
EXPECT_TRUE(*x == 42);
}
{
int i = 42;
int* p = &i;
const auto x = make_not_null(p);
helper(make_not_null(p));
helper_const(make_not_null(p));
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
const int* p = &i;
const auto x = make_not_null(p);
#ifdef CONFIRM_COMPILATION_ERRORS
helper(make_not_null(p));
#endif
helper_const(make_not_null(p));
EXPECT_TRUE(*x == 42);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestMakeNotNull";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
{
const auto workaround_macro = []() {
int* p1 = nullptr;
const auto x = make_not_null(p1);
EXPECT_TRUE(*x == 42);
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
const auto workaround_macro = []() {
const int* p1 = nullptr;
const auto x = make_not_null(p1);
EXPECT_TRUE(*x == 42);
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
int* p = nullptr;
EXPECT_DEATH(helper(make_not_null(p)), expected);
EXPECT_DEATH(helper_const(make_not_null(p)), expected);
}
#ifdef CONFIRM_COMPILATION_ERRORS
{
EXPECT_DEATH(make_not_null(nullptr), expected);
EXPECT_DEATH(helper(make_not_null(nullptr)), expected);
EXPECT_DEATH(helper_const(make_not_null(nullptr)), expected);
}
#endif
}
TEST(notnull_tests, TestStdHash)
{
{
int x = 42;
int y = 99;
not_null<int*> nn{&x};
const not_null<int*> cnn{&x};
std::hash<not_null<int*>> hash_nn;
std::hash<int*> hash_intptr;
EXPECT_TRUE(hash_nn(nn) == hash_intptr(&x));
EXPECT_FALSE(hash_nn(nn) == hash_intptr(&y));
EXPECT_FALSE(hash_nn(nn) == hash_intptr(nullptr));
}
{
const int x = 42;
const int y = 99;
not_null<const int*> nn{&x};
const not_null<const int*> cnn{&x};
std::hash<not_null<const int*>> hash_nn;
std::hash<const int*> hash_intptr;
EXPECT_TRUE(hash_nn(nn) == hash_intptr(&x));
EXPECT_FALSE(hash_nn(nn) == hash_intptr(&y));
EXPECT_FALSE(hash_nn(nn) == hash_intptr(nullptr));
}
}

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gtest/gtest.h>
#include <gsl/pointers> // for owner
using namespace gsl;
GSL_SUPPRESS(f .23) // NO-FORMAT: attribute
void f(int* i) { *i += 1; }
TEST(owner_tests, basic_test)
{
owner<int*> p = new int(120);
EXPECT_TRUE(*p == 120);
f(p);
EXPECT_TRUE(*p == 121);
delete p;
}
TEST(owner_tests, check_pointer_constraint)
{
#ifdef CONFIRM_COMPILATION_ERRORS
{
owner<int> integerTest = 10;
owner<std::shared_ptr<int>> sharedPtrTest(new int(10));
}
#endif
}

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380
Telegram/ThirdParty/GSL/tests/span_ext_tests.cpp vendored Normal file
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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gtest/gtest.h>
#include <gsl/span> // for span and span_ext
#include <gsl/util> // for narrow_cast, at
#include <array> // for array
#include <exception> // for terminate
#include <iostream> // for cerr
#include <vector> // for vector
using namespace std;
using namespace gsl;
#include "deathTestCommon.h"
TEST(span_ext_test, make_span_from_pointer_length_constructor)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. from_pointer_length_constructor";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
int arr[4] = {1, 2, 3, 4};
{
auto s = make_span(&arr[0], 2);
EXPECT_TRUE(s.size() == 2);
EXPECT_TRUE(s.data() == &arr[0]);
EXPECT_TRUE(s[0] == 1);
EXPECT_TRUE(s[1] == 2);
}
{
int* p = nullptr;
auto s = make_span(p, narrow_cast<gsl::span<int>::size_type>(0));
EXPECT_TRUE(s.size() == 0);
EXPECT_TRUE(s.data() == nullptr);
}
{
int* p = nullptr;
auto workaround_macro = [=]() { make_span(p, 2); };
EXPECT_DEATH(workaround_macro(), expected);
}
}
TEST(span_ext_test, make_span_from_pointer_pointer_construction)
{
int arr[4] = {1, 2, 3, 4};
{
auto s = make_span(&arr[0], &arr[2]);
EXPECT_TRUE(s.size() == 2);
EXPECT_TRUE(s.data() == &arr[0]);
EXPECT_TRUE(s[0] == 1);
EXPECT_TRUE(s[1] == 2);
}
{
auto s = make_span(&arr[0], &arr[0]);
EXPECT_TRUE(s.size() == 0);
EXPECT_TRUE(s.data() == &arr[0]);
}
{
int* p = nullptr;
auto s = make_span(p, p);
EXPECT_TRUE(s.size() == 0);
EXPECT_TRUE(s.data() == nullptr);
}
}
TEST(span_ext_test, make_span_from_array_constructor)
{
int arr[5] = {1, 2, 3, 4, 5};
int arr2d[2][3] = {1, 2, 3, 4, 5, 6};
int arr3d[2][3][2] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
{
const auto s = make_span(arr);
EXPECT_TRUE(s.size() == 5);
EXPECT_TRUE(s.data() == std::addressof(arr[0]));
}
{
const auto s = make_span(std::addressof(arr2d[0]), 1);
EXPECT_TRUE(s.size() == 1);
EXPECT_TRUE(s.data() == std::addressof(arr2d[0]));
}
{
const auto s = make_span(std::addressof(arr3d[0]), 1);
EXPECT_TRUE(s.size() == 1);
EXPECT_TRUE(s.data() == std::addressof(arr3d[0]));
}
}
TEST(span_ext_test, make_span_from_dynamic_array_constructor)
{
double(*arr)[3][4] = new double[100][3][4];
{
auto s = make_span(&arr[0][0][0], 10);
EXPECT_TRUE(s.size() == 10);
EXPECT_TRUE(s.data() == &arr[0][0][0]);
}
delete[] arr;
}
TEST(span_ext_test, make_span_from_std_array_constructor)
{
std::array<int, 4> arr = {1, 2, 3, 4};
{
auto s = make_span(arr);
EXPECT_TRUE(s.size() == arr.size());
EXPECT_TRUE(s.data() == arr.data());
}
// This test checks for the bug found in gcc 6.1, 6.2, 6.3, 6.4, 6.5 7.1, 7.2, 7.3 - issue #590
{
gsl::span<int> s1 = make_span(arr);
static gsl::span<int> s2;
s2 = s1;
#if defined(__GNUC__) && __GNUC__ == 6 && (__GNUC_MINOR__ == 4 || __GNUC_MINOR__ == 5) && \
__GNUC_PATCHLEVEL__ == 0 && defined(__OPTIMIZE__)
// Known to be broken in gcc 6.4 and 6.5 with optimizations
// Issue in gcc: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83116
EXPECT_TRUE(s1.size() == 4);
EXPECT_TRUE(s2.size() == 0);
#else
EXPECT_TRUE(s1.size() == s2.size());
#endif
}
}
TEST(span_ext_test, make_span_from_const_std_array_constructor)
{
const std::array<int, 4> arr = {1, 2, 3, 4};
{
auto s = make_span(arr);
EXPECT_TRUE(s.size() == arr.size());
EXPECT_TRUE(s.data() == arr.data());
}
}
TEST(span_ext_test, make_span_from_std_array_const_constructor)
{
std::array<const int, 4> arr = {1, 2, 3, 4};
{
auto s = make_span(arr);
EXPECT_TRUE(s.size() == arr.size());
EXPECT_TRUE(s.data() == arr.data());
}
}
TEST(span_ext_test, make_span_from_container_constructor)
{
std::vector<int> v = {1, 2, 3};
const std::vector<int> cv = v;
{
auto s = make_span(v);
EXPECT_TRUE(s.size() == v.size());
EXPECT_TRUE(s.data() == v.data());
auto cs = make_span(cv);
EXPECT_TRUE(cs.size() == cv.size());
EXPECT_TRUE(cs.data() == cv.data());
}
}
TEST(span_test, interop_with_gsl_at)
{
std::vector<int> vec{1, 2, 3, 4, 5};
gsl::span<int> sp{vec};
std::vector<int> cvec{1, 2, 3, 4, 5};
gsl::span<int> csp{cvec};
for (gsl::index i = 0; i < gsl::narrow_cast<gsl::index>(vec.size()); ++i)
{
EXPECT_TRUE(&gsl::at(sp, i) == &vec[gsl::narrow_cast<size_t>(i)]);
EXPECT_TRUE(&gsl::at(csp, i) == &cvec[gsl::narrow_cast<size_t>(i)]);
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. interop_with_gsl_at";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
EXPECT_DEATH(gsl::at(sp, -1), expected);
EXPECT_DEATH(gsl::at(sp, gsl::narrow_cast<gsl::index>(sp.size())), expected);
EXPECT_DEATH(gsl::at(csp, -1), expected);
EXPECT_DEATH(gsl::at(csp, gsl::narrow_cast<gsl::index>(sp.size())), expected);
}
TEST(span_ext_test, iterator_free_functions)
{
int a[] = {1, 2, 3, 4};
gsl::span<int> s{a};
EXPECT_TRUE((std::is_same<decltype(s.begin()), decltype(begin(s))>::value));
EXPECT_TRUE((std::is_same<decltype(s.end()), decltype(end(s))>::value));
EXPECT_TRUE((std::is_same<decltype(std::cbegin(s)), decltype(cbegin(s))>::value));
EXPECT_TRUE((std::is_same<decltype(std::cend(s)), decltype(cend(s))>::value));
EXPECT_TRUE((std::is_same<decltype(s.rbegin()), decltype(rbegin(s))>::value));
EXPECT_TRUE((std::is_same<decltype(s.rend()), decltype(rend(s))>::value));
EXPECT_TRUE((std::is_same<decltype(std::crbegin(s)), decltype(crbegin(s))>::value));
EXPECT_TRUE((std::is_same<decltype(std::crend(s)), decltype(crend(s))>::value));
EXPECT_TRUE(s.begin() == begin(s));
EXPECT_TRUE(s.end() == end(s));
EXPECT_TRUE(s.rbegin() == rbegin(s));
EXPECT_TRUE(s.rend() == rend(s));
EXPECT_TRUE(s.begin() == cbegin(s));
EXPECT_TRUE(s.end() == cend(s));
EXPECT_TRUE(s.rbegin() == crbegin(s));
EXPECT_TRUE(s.rend() == crend(s));
}
TEST(span_ext_test, ssize_free_function)
{
int a[] = {1, 2, 3, 4};
gsl::span<int> s{a};
EXPECT_FALSE((std::is_same<decltype(s.size()), decltype(ssize(s))>::value));
EXPECT_TRUE(s.size() == static_cast<std::size_t>(ssize(s)));
}
#ifndef GSL_KERNEL_MODE
TEST(span_ext_test, comparison_operators)
{
{
gsl::span<int> s1;
gsl::span<int> s2;
EXPECT_TRUE(s1 == s2);
EXPECT_FALSE(s1 != s2);
EXPECT_FALSE(s1 < s2);
EXPECT_TRUE(s1 <= s2);
EXPECT_FALSE(s1 > s2);
EXPECT_TRUE(s1 >= s2);
EXPECT_TRUE(s2 == s1);
EXPECT_FALSE(s2 != s1);
EXPECT_FALSE(s2 != s1);
EXPECT_TRUE(s2 <= s1);
EXPECT_FALSE(s2 > s1);
EXPECT_TRUE(s2 >= s1);
}
{
int arr[] = {2, 1};
gsl::span<int> s1 = arr;
gsl::span<int> s2 = arr;
EXPECT_TRUE(s1 == s2);
EXPECT_FALSE(s1 != s2);
EXPECT_FALSE(s1 < s2);
EXPECT_TRUE(s1 <= s2);
EXPECT_FALSE(s1 > s2);
EXPECT_TRUE(s1 >= s2);
EXPECT_TRUE(s2 == s1);
EXPECT_FALSE(s2 != s1);
EXPECT_FALSE(s2 < s1);
EXPECT_TRUE(s2 <= s1);
EXPECT_FALSE(s2 > s1);
EXPECT_TRUE(s2 >= s1);
}
{
int arr[] = {2, 1}; // bigger
gsl::span<int> s1;
gsl::span<int> s2 = arr;
EXPECT_TRUE(s1 != s2);
EXPECT_TRUE(s2 != s1);
EXPECT_FALSE(s1 == s2);
EXPECT_FALSE(s2 == s1);
EXPECT_TRUE(s1 < s2);
EXPECT_FALSE(s2 < s1);
EXPECT_TRUE(s1 <= s2);
EXPECT_FALSE(s2 <= s1);
EXPECT_TRUE(s2 > s1);
EXPECT_FALSE(s1 > s2);
EXPECT_TRUE(s2 >= s1);
EXPECT_FALSE(s1 >= s2);
}
{
int arr1[] = {1, 2};
int arr2[] = {1, 2};
gsl::span<int> s1 = arr1;
gsl::span<int> s2 = arr2;
EXPECT_TRUE(s1 == s2);
EXPECT_FALSE(s1 != s2);
EXPECT_FALSE(s1 < s2);
EXPECT_TRUE(s1 <= s2);
EXPECT_FALSE(s1 > s2);
EXPECT_TRUE(s1 >= s2);
EXPECT_TRUE(s2 == s1);
EXPECT_FALSE(s2 != s1);
EXPECT_FALSE(s2 < s1);
EXPECT_TRUE(s2 <= s1);
EXPECT_FALSE(s2 > s1);
EXPECT_TRUE(s2 >= s1);
}
{
int arr[] = {1, 2, 3};
gsl::span<int> s1 = {&arr[0], 2}; // shorter
gsl::span<int> s2 = arr; // longer
EXPECT_TRUE(s1 != s2);
EXPECT_TRUE(s2 != s1);
EXPECT_FALSE(s1 == s2);
EXPECT_FALSE(s2 == s1);
EXPECT_TRUE(s1 < s2);
EXPECT_FALSE(s2 < s1);
EXPECT_TRUE(s1 <= s2);
EXPECT_FALSE(s2 <= s1);
EXPECT_TRUE(s2 > s1);
EXPECT_FALSE(s1 > s2);
EXPECT_TRUE(s2 >= s1);
EXPECT_FALSE(s1 >= s2);
}
{
int arr1[] = {1, 2}; // smaller
int arr2[] = {2, 1}; // bigger
gsl::span<int> s1 = arr1;
gsl::span<int> s2 = arr2;
EXPECT_TRUE(s1 != s2);
EXPECT_TRUE(s2 != s1);
EXPECT_FALSE(s1 == s2);
EXPECT_FALSE(s2 == s1);
EXPECT_TRUE(s1 < s2);
EXPECT_FALSE(s2 < s1);
EXPECT_TRUE(s1 <= s2);
EXPECT_FALSE(s2 <= s1);
EXPECT_TRUE(s2 > s1);
EXPECT_FALSE(s1 > s2);
EXPECT_TRUE(s2 >= s1);
EXPECT_FALSE(s1 >= s2);
}
}
#endif // GSL_KERNEL_MODE

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gsl/pointers> // for not_null, operator<, operator<=, operator>
#include <gtest/gtest.h>
#include "deathTestCommon.h"
using namespace gsl;
namespace
{
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool helper(not_null<int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool helper_const(not_null<const int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool strict_helper(strict_not_null<int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool strict_helper_const(strict_not_null<const int*> p) { return *p == 12; }
#ifdef CONFIRM_COMPILATION_ERRORS
int* return_pointer() { return nullptr; }
const int* return_pointer_const() { return nullptr; }
#endif
} // namespace
TEST(strict_notnull_tests, TestStrictNotNull)
{
{
// raw ptr <-> strict_not_null
int x = 42;
#ifdef CONFIRM_COMPILATION_ERRORS
strict_not_null<int*> snn = &x;
strict_helper(&x);
strict_helper_const(&x);
strict_helper(return_pointer());
strict_helper_const(return_pointer_const());
#endif
const strict_not_null<int*> snn1{&x};
helper(snn1);
helper_const(snn1);
EXPECT_TRUE(*snn1 == 42);
}
{
// raw ptr <-> strict_not_null
const int x = 42;
#ifdef CONFIRM_COMPILATION_ERRORS
strict_not_null<int*> snn = &x;
strict_helper(&x);
strict_helper_const(&x);
strict_helper(return_pointer());
strict_helper_const(return_pointer_const());
#endif
const strict_not_null<const int*> snn1{&x};
#ifdef CONFIRM_COMPILATION_ERRORS
helper(snn1);
#endif
helper_const(snn1);
EXPECT_TRUE(*snn1 == 42);
}
{
// strict_not_null -> strict_not_null
int x = 42;
strict_not_null<int*> snn1{&x};
const strict_not_null<int*> snn2{&x};
strict_helper(snn1);
strict_helper_const(snn1);
strict_helper_const(snn2);
EXPECT_TRUE(snn1 == snn2);
}
{
// strict_not_null -> strict_not_null
const int x = 42;
strict_not_null<const int*> snn1{&x};
const strict_not_null<const int*> snn2{&x};
#ifdef CONFIRM_COMPILATION_ERRORS
strict_helper(snn1);
#endif
strict_helper_const(snn1);
strict_helper_const(snn2);
EXPECT_TRUE(snn1 == snn2);
}
{
// strict_not_null -> not_null
int x = 42;
strict_not_null<int*> snn{&x};
const not_null<int*> nn1 = snn;
const not_null<int*> nn2{snn};
helper(snn);
helper_const(snn);
EXPECT_TRUE(snn == nn1);
EXPECT_TRUE(snn == nn2);
}
{
// strict_not_null -> not_null
const int x = 42;
strict_not_null<const int*> snn{&x};
const not_null<const int*> nn1 = snn;
const not_null<const int*> nn2{snn};
#ifdef CONFIRM_COMPILATION_ERRORS
helper(snn);
#endif
helper_const(snn);
EXPECT_TRUE(snn == nn1);
EXPECT_TRUE(snn == nn2);
}
{
// not_null -> strict_not_null
int x = 42;
not_null<int*> nn{&x};
const strict_not_null<int*> snn1{nn};
const strict_not_null<int*> snn2{nn};
strict_helper(nn);
strict_helper_const(nn);
EXPECT_TRUE(snn1 == nn);
EXPECT_TRUE(snn2 == nn);
std::hash<strict_not_null<int*>> hash_snn;
std::hash<not_null<int*>> hash_nn;
EXPECT_TRUE(hash_nn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_snn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_nn(snn1) == hash_nn(snn2));
EXPECT_TRUE(hash_snn(snn1) == hash_snn(nn));
}
{
// not_null -> strict_not_null
const int x = 42;
not_null<const int*> nn{&x};
const strict_not_null<const int*> snn1{nn};
const strict_not_null<const int*> snn2{nn};
#ifdef CONFIRM_COMPILATION_ERRORS
strict_helper(nn);
#endif
strict_helper_const(nn);
EXPECT_TRUE(snn1 == nn);
EXPECT_TRUE(snn2 == nn);
std::hash<strict_not_null<const int*>> hash_snn;
std::hash<not_null<const int*>> hash_nn;
EXPECT_TRUE(hash_nn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_snn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_nn(snn1) == hash_nn(snn2));
EXPECT_TRUE(hash_snn(snn1) == hash_snn(nn));
}
#ifdef CONFIRM_COMPILATION_ERRORS
{
strict_not_null<int*> p{nullptr};
}
#endif
}
#if defined(__cplusplus) && (__cplusplus >= 201703L)
TEST(strict_notnull_tests, TestStrictNotNullConstructorTypeDeduction)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestStrictNotNullConstructorTypeDeduction";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
{
int i = 42;
strict_not_null x{&i};
helper(strict_not_null{&i});
helper_const(strict_not_null{&i});
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
strict_not_null x{&i};
#ifdef CONFIRM_COMPILATION_ERRORS
helper(strict_not_null{&i});
#endif
helper_const(strict_not_null{&i});
EXPECT_TRUE(*x == 42);
}
{
int i = 42;
int* p = &i;
strict_not_null x{p};
helper(strict_not_null{p});
helper_const(strict_not_null{p});
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
const int* p = &i;
strict_not_null x{p};
#ifdef CONFIRM_COMPILATION_ERRORS
helper(strict_not_null{p});
#endif
helper_const(strict_not_null{p});
EXPECT_TRUE(*x == 42);
}
{
auto workaround_macro = []() {
int* p1 = nullptr;
const strict_not_null x{p1};
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
auto workaround_macro = []() {
const int* p1 = nullptr;
const strict_not_null x{p1};
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
int* p = nullptr;
EXPECT_DEATH(helper(strict_not_null{p}), expected);
EXPECT_DEATH(helper_const(strict_not_null{p}), expected);
}
#ifdef CONFIRM_COMPILATION_ERRORS
{
strict_not_null x{nullptr};
helper(strict_not_null{nullptr});
helper_const(strict_not_null{nullptr});
}
#endif
}
#endif // #if defined(__cplusplus) && (__cplusplus >= 201703L)

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///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////
#include <gtest/gtest.h>
#include <algorithm> // for move
#include <complex>
#include <cstddef> // for std::ptrdiff_t
#include <cstdint> // for uint32_t, int32_t
#include <functional> // for reference_wrapper, _Bind_helper<>::type
#include <gsl/narrow> // for narrow, narrowing_error
#include <gsl/util> // finally, narrow_cast
#include <limits> // for numeric_limits
#include <type_traits> // for is_same
using namespace gsl;
namespace
{
void f(int& i) { i += 1; }
static int j = 0;
void g() { j += 1; }
} // namespace
TEST(utils_tests, sanity_check_for_gsl_index_typedef)
{
static_assert(std::is_same<gsl::index, std::ptrdiff_t>::value,
"gsl::index represents wrong arithmetic type");
}
TEST(utils_tests, finally_lambda)
{
int i = 0;
{
auto _ = finally([&]() { f(i); });
EXPECT_TRUE(i == 0);
}
EXPECT_TRUE(i == 1);
}
TEST(utils_tests, finally_lambda_move)
{
int i = 0;
{
auto _1 = finally([&]() { f(i); });
{
auto _2 = std::move(_1);
EXPECT_TRUE(i == 0);
}
EXPECT_TRUE(i == 1);
{
auto _2 = std::move(_1);
EXPECT_TRUE(i == 1);
}
EXPECT_TRUE(i == 1);
}
EXPECT_TRUE(i == 1);
}
TEST(utils_tests, finally_const_lvalue_lambda)
{
int i = 0;
{
const auto const_lvalue_lambda = [&]() { f(i); };
auto _ = finally(const_lvalue_lambda);
EXPECT_TRUE(i == 0);
}
EXPECT_TRUE(i == 1);
}
TEST(utils_tests, finally_mutable_lvalue_lambda)
{
int i = 0;
{
auto mutable_lvalue_lambda = [&]() { f(i); };
auto _ = finally(mutable_lvalue_lambda);
EXPECT_TRUE(i == 0);
}
EXPECT_TRUE(i == 1);
}
TEST(utils_tests, finally_function_with_bind)
{
int i = 0;
{
auto _ = finally([&i] { return f(i); });
EXPECT_TRUE(i == 0);
}
EXPECT_TRUE(i == 1);
}
TEST(utils_tests, finally_function_ptr)
{
j = 0;
{
auto _ = finally(&g);
EXPECT_TRUE(j == 0);
}
EXPECT_TRUE(j == 1);
}
TEST(utils_tests, finally_function)
{
j = 0;
{
auto _ = finally(g);
EXPECT_TRUE(j == 0);
}
EXPECT_TRUE(j == 1);
}
TEST(utils_tests, narrow_cast)
{
int n = 120;
char c = narrow_cast<char>(n);
EXPECT_TRUE(c == 120);
n = 300;
unsigned char uc = narrow_cast<unsigned char>(n);
EXPECT_TRUE(uc == 44);
}
#ifndef GSL_KERNEL_MODE
TEST(utils_tests, narrow)
{
int n = 120;
const char c = narrow<char>(n);
EXPECT_TRUE(c == 120);
n = 300;
EXPECT_THROW(narrow<char>(n), narrowing_error);
const auto int32_max = std::numeric_limits<int32_t>::max();
const auto int32_min = std::numeric_limits<int32_t>::min();
EXPECT_TRUE(narrow<uint32_t>(int32_t(0)) == 0);
EXPECT_TRUE(narrow<uint32_t>(int32_t(1)) == 1);
EXPECT_TRUE(narrow<uint32_t>(int32_max) == static_cast<uint32_t>(int32_max));
EXPECT_THROW(narrow<uint32_t>(int32_t(-1)), narrowing_error);
EXPECT_THROW(narrow<uint32_t>(int32_min), narrowing_error);
n = -42;
EXPECT_THROW(narrow<unsigned>(n), narrowing_error);
EXPECT_TRUE(
narrow<std::complex<float>>(std::complex<double>(4, 2)) == std::complex<float>(4, 2));
EXPECT_THROW(narrow<std::complex<float>>(std::complex<double>(4.2)), narrowing_error);
EXPECT_TRUE(narrow<int>(float(1)) == 1);
}
#endif // GSL_KERNEL_MODE