c9af0e61fa
Neither the current C++2b draft, nor any revision of [p1135], nor libstdc++, claims that `counting_semaphore` should be default-constructible. I think this was just a copy-paste issue somehow. Also, `explicit` was missing from the constructor. Also, `constexpr` remains missing; but that's probably more of a technical limitation, since apparently there are some platforms where we don't (can't??) use the atomic implementation and have to rely on pthreads, which obviously isn't constexpr. Differential Revision: https://reviews.llvm.org/D110042
31 lines
1.0 KiB
C++
31 lines
1.0 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 0 // TODO FIXME: the ctor should be constexpr when TEST_STD_VER > 17
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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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