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Telegram/ThirdParty/GSL/tests/at_tests.cpp

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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