29 lines
578 B
C++
29 lines
578 B
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <mutex>
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// struct once_flag;
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// constexpr once_flag() noexcept;
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#include <mutex>
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int main()
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{
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{
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std::once_flag f;
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}
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#ifndef _LIBCPP_HAS_NO_CONSTEXPR
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{
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constexpr std::once_flag f;
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}
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#endif
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}
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