1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___CONCEPTS_BOOLEAN_TESTABLE_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___CONCEPTS_BOOLEAN_TESTABLE_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__concepts/convertible_to.h> 1373fbae83SNikolas Klauser #include <__cxx03/__config> 1473fbae83SNikolas Klauser #include <__cxx03/__utility/forward.h> 15e78f53d1SNikolas Klauser 16e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17e78f53d1SNikolas Klauser # pragma GCC system_header 18e78f53d1SNikolas Klauser #endif 19e78f53d1SNikolas Klauser 20e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 21e78f53d1SNikolas Klauser 22e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser // [concepts.booleantestable] 25e78f53d1SNikolas Klauser 26e78f53d1SNikolas Klauser template <class _Tp> 27e78f53d1SNikolas Klauser concept __boolean_testable_impl = convertible_to<_Tp, bool>; 28e78f53d1SNikolas Klauser 29e78f53d1SNikolas Klauser template <class _Tp> 30e78f53d1SNikolas Klauser concept __boolean_testable = __boolean_testable_impl<_Tp> && requires(_Tp&& __t) { 31e78f53d1SNikolas Klauser { !std::forward<_Tp>(__t) } -> __boolean_testable_impl; 32e78f53d1SNikolas Klauser }; 33e78f53d1SNikolas Klauser 34e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 35e78f53d1SNikolas Klauser 36e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 37e78f53d1SNikolas Klauser 38*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___CONCEPTS_BOOLEAN_TESTABLE_H 39