1fe6060f1SDimitry Andric // -*- C++ -*- 2fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___FUNCTIONAL_NOT_FN_H 11fe6060f1SDimitry Andric #define _LIBCPP___FUNCTIONAL_NOT_FN_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 14fe6060f1SDimitry Andric #include <__functional/invoke.h> 1504eeddc0SDimitry Andric #include <__functional/perfect_forward.h> 1606c3fb27SDimitry Andric #include <__type_traits/decay.h> 1706c3fb27SDimitry Andric #include <__type_traits/enable_if.h> 1806c3fb27SDimitry Andric #include <__type_traits/is_constructible.h> 1981ad6265SDimitry Andric #include <__utility/forward.h> 20fe6060f1SDimitry Andric 21fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22fe6060f1SDimitry Andric # pragma GCC system_header 23fe6060f1SDimitry Andric #endif 24fe6060f1SDimitry Andric 25fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 26fe6060f1SDimitry Andric 2706c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 17 28fe6060f1SDimitry Andric 29349cc55cSDimitry Andric struct __not_fn_op { 30fe6060f1SDimitry Andric template <class... _Args> 31*cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 auto operator()(_Args&&... __args) const 325f757f3fSDimitry Andric noexcept(noexcept(!std::invoke(std::forward<_Args>(__args)...))) 33*cb14a3feSDimitry Andric -> decltype(!std::invoke(std::forward<_Args>(__args)...)) { 34*cb14a3feSDimitry Andric return !std::invoke(std::forward<_Args>(__args)...); 35*cb14a3feSDimitry Andric } 36fe6060f1SDimitry Andric }; 37fe6060f1SDimitry Andric 38349cc55cSDimitry Andric template <class _Fn> 39349cc55cSDimitry Andric struct __not_fn_t : __perfect_forward<__not_fn_op, _Fn> { 40349cc55cSDimitry Andric using __perfect_forward<__not_fn_op, _Fn>::__perfect_forward; 41349cc55cSDimitry Andric }; 42349cc55cSDimitry Andric 43*cb14a3feSDimitry Andric template <class _Fn, 44*cb14a3feSDimitry Andric class = enable_if_t< is_constructible_v<decay_t<_Fn>, _Fn> && is_move_constructible_v<decay_t<_Fn>> >> 45*cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 auto not_fn(_Fn&& __f) { 465f757f3fSDimitry Andric return __not_fn_t<decay_t<_Fn>>(std::forward<_Fn>(__f)); 47fe6060f1SDimitry Andric } 48fe6060f1SDimitry Andric 4906c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 17 50fe6060f1SDimitry Andric 51fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 52fe6060f1SDimitry Andric 53fe6060f1SDimitry Andric #endif // _LIBCPP___FUNCTIONAL_NOT_FN_H 54