c2df707666
There are a handful of standard library types that are intended to support CTAD but don't need any explicit deduction guides to do so. This patch adds a dummy deduction guide to those types to suppress -Wctad-maybe-unsupported (which gets emitted in user code). This is a re-application of the original patch by Eric Fiselier in fcd549a7d828 which had been reverted due to reasons lost at this point. I also added the macro to a few more types. Reviving this patch was prompted by the discussion on https://llvm.org/D133425. Differential Revision: https://reviews.llvm.org/D133535
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: 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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