1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H 10*4bdff4beSrobert #define _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__concepts/convertible_to.h> 13*4bdff4beSrobert #include <__config> 14*4bdff4beSrobert #include <__utility/forward.h> 15*4bdff4beSrobert 16*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17*4bdff4beSrobert # pragma GCC system_header 18*4bdff4beSrobert #endif 19*4bdff4beSrobert 20*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 21*4bdff4beSrobert 22*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 23*4bdff4beSrobert 24*4bdff4beSrobert // [concepts.booleantestable] 25*4bdff4beSrobert 26*4bdff4beSrobert template<class _Tp> 27*4bdff4beSrobert concept __boolean_testable_impl = convertible_to<_Tp, bool>; 28*4bdff4beSrobert 29*4bdff4beSrobert template<class _Tp> requires(_Tp && __t)30*4bdff4beSrobertconcept __boolean_testable = __boolean_testable_impl<_Tp> && requires(_Tp&& __t) { 31*4bdff4beSrobert { !_VSTD::forward<_Tp>(__t) } -> __boolean_testable_impl; 32*4bdff4beSrobert }; 33*4bdff4beSrobert 34*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 35*4bdff4beSrobert 36*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 37*4bdff4beSrobert 38*4bdff4beSrobert #endif // _LIBCPP___CONCEPTS_BOOLEAN_TESTABLE_H 39