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59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
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// -*- 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_MEM_FN_H
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#define _LIBCPP___FUNCTIONAL_MEM_FN_H
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#include <__config>
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#include <__functional/binary_function.h>
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#include <__functional/invoke.h>
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#include <__functional/weak_result_type.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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template <class _Tp>
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class __mem_fn : public __weak_result_type<_Tp>
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{
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public:
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// types
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typedef _Tp type;
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private:
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type __f_;
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public:
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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__mem_fn(type __f) _NOEXCEPT : __f_(__f) {}
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// invoke
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template <class... _ArgTypes>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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typename __invoke_return<type, _ArgTypes...>::type
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operator() (_ArgTypes&&... __args) const {
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return std::__invoke(__f_, std::forward<_ArgTypes>(__args)...);
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}
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};
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template<class _Rp, class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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__mem_fn<_Rp _Tp::*>
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mem_fn(_Rp _Tp::* __pm) _NOEXCEPT
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{
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return __mem_fn<_Rp _Tp::*>(__pm);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_MEM_FN_H
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