1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___CXX03___FUNCTIONAL_MEM_FN_H 11 #define _LIBCPP___CXX03___FUNCTIONAL_MEM_FN_H 12 13 #include <__cxx03/__config> 14 #include <__cxx03/__functional/binary_function.h> 15 #include <__cxx03/__functional/weak_result_type.h> 16 #include <__cxx03/__type_traits/invoke.h> 17 #include <__cxx03/__utility/forward.h> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 # pragma GCC system_header 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Tp> 26 class __mem_fn : public __weak_result_type<_Tp> { 27 public: 28 // types 29 typedef _Tp type; 30 31 private: 32 type __f_; 33 34 public: __mem_fn(type __f)35 _LIBCPP_HIDE_FROM_ABI __mem_fn(type __f) _NOEXCEPT : __f_(__f) {} 36 37 // invoke 38 template <class... _ArgTypes> operator()39 _LIBCPP_HIDE_FROM_ABI typename __invoke_return<type, _ArgTypes...>::type operator()(_ArgTypes&&... __args) const { 40 return std::__invoke(__f_, std::forward<_ArgTypes>(__args)...); 41 } 42 }; 43 44 template <class _Rp, class _Tp> mem_fn(_Rp _Tp::* __pm)45inline _LIBCPP_HIDE_FROM_ABI __mem_fn<_Rp _Tp::*> mem_fn(_Rp _Tp::* __pm) _NOEXCEPT { 46 return __mem_fn<_Rp _Tp::*>(__pm); 47 } 48 49 _LIBCPP_END_NAMESPACE_STD 50 51 #endif // _LIBCPP___CXX03___FUNCTIONAL_MEM_FN_H 52