0fa05456a8
Currently we're using quite different internal names for the `std::invoke` family of type traits. This adds a layer around the current implementation to make it easier to understand when it is used and makes it easier to define multiple implementations of it.
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// -*- 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/weak_result_type.h>
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#include <__type_traits/invoke.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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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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __mem_fn(type __f) _NOEXCEPT : __f_(__f) {}
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// invoke
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template <class... _ArgTypes>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __invoke_result_t<const _Tp&, _ArgTypes...>
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operator()(_ArgTypes&&... __args) const _NOEXCEPT_(__is_nothrow_invocable_v<const _Tp&, _ArgTypes...>) {
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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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __mem_fn<_Rp _Tp::*> mem_fn(_Rp _Tp::*__pm) _NOEXCEPT {
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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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