1349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 2349cc55cSDimitry Andric // 3349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6349cc55cSDimitry Andric // 7349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 8349cc55cSDimitry Andric 9349cc55cSDimitry Andric #ifndef _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H 10349cc55cSDimitry Andric #define _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H 11349cc55cSDimitry Andric 12349cc55cSDimitry Andric #include <__concepts/convertible_to.h> 13349cc55cSDimitry Andric #include <__config> 14349cc55cSDimitry Andric #include <__utility/forward.h> 15349cc55cSDimitry Andric 16349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17349cc55cSDimitry Andric # pragma GCC system_header 18349cc55cSDimitry Andric #endif 19349cc55cSDimitry Andric 20349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21349cc55cSDimitry Andric 2206c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 23349cc55cSDimitry Andric 24349cc55cSDimitry Andric // [concepts.booleantestable] 25349cc55cSDimitry Andric 26349cc55cSDimitry Andric template <class _Tp> 27349cc55cSDimitry Andric concept __boolean_testable_impl = convertible_to<_Tp, bool>; 28349cc55cSDimitry Andric 29349cc55cSDimitry Andric template <class _Tp> 30349cc55cSDimitry Andric concept __boolean_testable = __boolean_testable_impl<_Tp> && requires(_Tp&& __t) { 31*5f757f3fSDimitry Andric { !std::forward<_Tp>(__t) } -> __boolean_testable_impl; 32349cc55cSDimitry Andric }; 33349cc55cSDimitry Andric 3406c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 35349cc55cSDimitry Andric 36349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 37349cc55cSDimitry Andric 38349cc55cSDimitry Andric #endif // _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H 39