368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
55 lines
1.6 KiB
C++
55 lines
1.6 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 <__utility/forward.h>
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#include <type_traits>
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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 > 14
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struct __not_fn_op {
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_CONSTEXPR_AFTER_CXX17 auto operator()(_Args&&... __args) const
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noexcept(noexcept(!_VSTD::invoke(_VSTD::forward<_Args>(__args)...)))
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-> decltype( !_VSTD::invoke(_VSTD::forward<_Args>(__args)...))
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{ return !_VSTD::invoke(_VSTD::forward<_Args>(__args)...); }
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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, class = enable_if_t<
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is_constructible_v<decay_t<_Fn>, _Fn> &&
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is_move_constructible_v<decay_t<_Fn>>
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>>
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_LIBCPP_HIDE_FROM_ABI
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_LIBCPP_CONSTEXPR_AFTER_CXX17 auto not_fn(_Fn&& __f) {
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return __not_fn_t<decay_t<_Fn>>(_VSTD::forward<_Fn>(__f));
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}
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_NOT_FN_H
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