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Telegram/ThirdParty/range-v3/test/utility/scope_exit.cpp

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+// Range v3 library
+//
+//  Copyright Eric Niebler 2017-present
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+
+#include <range/v3/utility/scope_exit.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+
+RANGES_DIAGNOSTIC_IGNORE_UNNEEDED_MEMBER
+
+namespace
+{
+    int i = 0;
+
+    struct NoexceptFalse
+    {
+        NoexceptFalse() {}
+        NoexceptFalse(NoexceptFalse const &) noexcept(false)
+        {}
+
+        NoexceptFalse(NoexceptFalse &&) noexcept(false)
+        {
+            CHECK(false);
+        }
+
+        void operator()() const
+        {
+            ++i;
+        }
+    };
+
+    struct ThrowingCopy
+    {
+        ThrowingCopy() {}
+        [[noreturn]] ThrowingCopy(ThrowingCopy const &) noexcept(false)
+        {
+            throw 42;
+        }
+
+        ThrowingCopy(ThrowingCopy &&) noexcept(false)
+        {
+            CHECK(false);
+        }
+
+        void operator()() const
+        {
+            ++i;
+        }
+    };
+}
+
+int main()
+{
+    std::cout << "\nTesting scope_exit\n";
+
+    {
+        auto guard = ranges::make_scope_exit([&]{++i;});
+        CHECK(i == 0);
+    }
+    CHECK(i == 1);
+
+    {
+        auto guard = ranges::make_scope_exit(NoexceptFalse{});
+        CHECK(i == 1);
+    }
+    CHECK(i == 2);
+
+    try
+    {
+        auto guard = ranges::make_scope_exit(ThrowingCopy{});
+        CHECK(false);
+    }
+    catch(int)
+    {}
+    CHECK(i == 3);
+
+    return ::test_result();
+}