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38 lines
983 B
C
38 lines
983 B
C
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//===----------------------------------------------------------------------===//
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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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#ifndef _LIBCPP___CONCEPTS_CONVERTIBLE_TO_H
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#define _LIBCPP___CONCEPTS_CONVERTIBLE_TO_H
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#include <__config>
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#include <__type_traits/is_convertible.h>
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#include <__utility/declval.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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// [concept.convertible]
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template<class _From, class _To>
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concept convertible_to =
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is_convertible_v<_From, _To> &&
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requires {
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static_cast<_To>(std::declval<_From>());
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};
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_CONVERTIBLE_TO_H
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