| // -*- 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_MEM_FN_H |
| #define _LIBCPP___FUNCTIONAL_MEM_FN_H |
| |
| #include <__config> |
| #include <__functional/binary_function.h> |
| #include <__functional/invoke.h> |
| #include <__functional/weak_result_type.h> |
| #include <__utility/forward.h> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _Tp> |
| class __mem_fn : public __weak_result_type<_Tp> |
| { |
| public: |
| // types |
| typedef _Tp type; |
| private: |
| type __f_; |
| |
| public: |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| __mem_fn(type __f) _NOEXCEPT : __f_(__f) {} |
| |
| // invoke |
| template <class... _ArgTypes> |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| |
| typename __invoke_return<type, _ArgTypes...>::type |
| operator() (_ArgTypes&&... __args) const { |
| return std::__invoke(__f_, std::forward<_ArgTypes>(__args)...); |
| } |
| }; |
| |
| template<class _Rp, class _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| __mem_fn<_Rp _Tp::*> |
| mem_fn(_Rp _Tp::* __pm) _NOEXCEPT |
| { |
| return __mem_fn<_Rp _Tp::*>(__pm); |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___FUNCTIONAL_MEM_FN_H |