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___FUNCTIONAL_MEM_FN_H 11 #define _LIBCPP___FUNCTIONAL_MEM_FN_H 12 13 #include <__config> 14 #include <__functional/binary_function.h> 15 #include <__functional/invoke.h> 16 #include <__functional/weak_result_type.h> 17 #include <__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 { 28 public: 29 // types 30 typedef _Tp type; 31 private: 32 type __f_; 33 34 public: 35 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 36 __mem_fn(type __f) _NOEXCEPT : __f_(__f) {} 37 38 // invoke 39 template <class... _ArgTypes> 40 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 41 42 typename __invoke_return<type, _ArgTypes...>::type 43 operator() (_ArgTypes&&... __args) const { 44 return std::__invoke(__f_, std::forward<_ArgTypes>(__args)...); 45 } 46 }; 47 48 template<class _Rp, class _Tp> 49 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 50 __mem_fn<_Rp _Tp::*> 51 mem_fn(_Rp _Tp::* __pm) _NOEXCEPT 52 { 53 return __mem_fn<_Rp _Tp::*>(__pm); 54 } 55 56 _LIBCPP_END_NAMESPACE_STD 57 58 #endif // _LIBCPP___FUNCTIONAL_MEM_FN_H 59