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53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FUNCTIONAL_NOT_FN_H
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#define _LIBCPP___FUNCTIONAL_NOT_FN_H
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#include <__config>
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#include <__functional/invoke.h>
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#include <__functional/perfect_forward.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/is_constructible.h>
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#include <__utility/forward.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 17
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struct __not_fn_op {
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 auto operator()(_Args&&... __args) const
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noexcept(noexcept(!std::invoke(std::forward<_Args>(__args)...)))
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-> decltype(!std::invoke(std::forward<_Args>(__args)...)) {
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return !std::invoke(std::forward<_Args>(__args)...);
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}
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};
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template <class _Fn>
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struct __not_fn_t : __perfect_forward<__not_fn_op, _Fn> {
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using __perfect_forward<__not_fn_op, _Fn>::__perfect_forward;
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};
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template <class _Fn,
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class = enable_if_t< is_constructible_v<decay_t<_Fn>, _Fn> && is_move_constructible_v<decay_t<_Fn>> >>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 auto not_fn(_Fn&& __f) {
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return __not_fn_t<decay_t<_Fn>>(std::forward<_Fn>(__f));
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}
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_NOT_FN_H
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