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d0eaf75320
These can't be made constexpr-constructible (constinit'able), so they aren't C++20-conforming. Also, the platform versions are going to be bigger than the atomic/futex version, so we'd have the awkward situation that `semaphore<42>` could be bigger than `semaphore<43>`, and that's just silly. Differential Revision: https://reviews.llvm.org/D110110
32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++03, c++11
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// <semaphore>
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// constexpr explicit counting_semaphore(ptrdiff_t desired);
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#include <semaphore>
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#include <type_traits>
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#include "test_macros.h"
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static_assert(!std::is_default_constructible<std::binary_semaphore>::value, "");
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static_assert(!std::is_default_constructible<std::counting_semaphore<>>::value, "");
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static_assert(!std::is_convertible<int, std::binary_semaphore>::value, "");
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static_assert(!std::is_convertible<int, std::counting_semaphore<>>::value, "");
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#if TEST_STD_VER > 17
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// Test constexpr-constructibility. (But not destructibility.)
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constinit std::binary_semaphore bs(1);
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constinit std::counting_semaphore cs(1);
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#endif
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