| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H |
| #define _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H |
| |
| #include <__concepts/convertible_to.h> |
| #include <__config> |
| #include <__utility/forward.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| // [concepts.booleantestable] |
| |
| template<class _Tp> |
| concept __boolean_testable_impl = convertible_to<_Tp, bool>; |
| |
| template<class _Tp> |
| concept __boolean_testable = __boolean_testable_impl<_Tp> && requires(_Tp&& __t) { |
| { !_VSTD::forward<_Tp>(__t) } -> __boolean_testable_impl; |
| }; |
| |
| #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H |
