| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___FUNCTIONAL_NOT_FN_H |
| #define _LIBCPP___FUNCTIONAL_NOT_FN_H |
| |
| #include <__config> |
| #include <__functional/perfect_forward.h> |
| #include <__functional/invoke.h> |
| #include <utility> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 14 |
| |
| struct __not_fn_op { |
| template <class... _Args> |
| _LIBCPP_HIDE_FROM_ABI |
| _LIBCPP_CONSTEXPR_AFTER_CXX17 auto operator()(_Args&&... __args) const |
| noexcept(noexcept(!_VSTD::invoke(_VSTD::forward<_Args>(__args)...))) |
| -> decltype( !_VSTD::invoke(_VSTD::forward<_Args>(__args)...)) |
| { return !_VSTD::invoke(_VSTD::forward<_Args>(__args)...); } |
| }; |
| |
| template <class _Fn> |
| struct __not_fn_t : __perfect_forward<__not_fn_op, _Fn> { |
| using __perfect_forward<__not_fn_op, _Fn>::__perfect_forward; |
| }; |
| |
| template <class _Fn, class = enable_if_t< |
| is_constructible_v<decay_t<_Fn>, _Fn> && |
| is_move_constructible_v<decay_t<_Fn>> |
| >> |
| _LIBCPP_HIDE_FROM_ABI |
| _LIBCPP_CONSTEXPR_AFTER_CXX17 auto not_fn(_Fn&& __f) { |
| return __not_fn_t<decay_t<_Fn>>(_VSTD::forward<_Fn>(__f)); |
| } |
| |
| #endif // _LIBCPP_STD_VER > 14 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___FUNCTIONAL_NOT_FN_H |
