90 lines
2.8 KiB
C++
90 lines
2.8 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___CXX03___FUNCTIONAL_REFERENCE_WRAPPER_H
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#define _LIBCPP___CXX03___FUNCTIONAL_REFERENCE_WRAPPER_H
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#include <__cxx03/__config>
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#include <__cxx03/__functional/weak_result_type.h>
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#include <__cxx03/__memory/addressof.h>
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#include <__cxx03/__type_traits/enable_if.h>
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#include <__cxx03/__type_traits/invoke.h>
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#include <__cxx03/__type_traits/is_const.h>
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#include <__cxx03/__type_traits/remove_cvref.h>
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#include <__cxx03/__type_traits/void_t.h>
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#include <__cxx03/__utility/declval.h>
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#include <__cxx03/__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 _LIBCPP_TEMPLATE_VIS reference_wrapper : 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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static void __fun(_Tp&) _NOEXCEPT;
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static void __fun(_Tp&&) = delete; // NOLINT(modernize-use-equals-delete) ; This is llvm.org/PR54276
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public:
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template <class _Up,
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class = __void_t<decltype(__fun(std::declval<_Up>()))>,
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__enable_if_t<!__is_same_uncvref<_Up, reference_wrapper>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI reference_wrapper(_Up&& __u) {
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type& __f = static_cast<_Up&&>(__u);
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__f_ = std::addressof(__f);
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}
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// access
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_LIBCPP_HIDE_FROM_ABI operator type&() const _NOEXCEPT { return *__f_; }
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_LIBCPP_HIDE_FROM_ABI type& get() const _NOEXCEPT { return *__f_; }
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// invoke
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template <class... _ArgTypes>
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_LIBCPP_HIDE_FROM_ABI typename __invoke_of<type&, _ArgTypes...>::type operator()(_ArgTypes&&... __args) const {
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return std::__invoke(get(), std::forward<_ArgTypes>(__args)...);
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}
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};
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<_Tp> ref(_Tp& __t) _NOEXCEPT {
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return reference_wrapper<_Tp>(__t);
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}
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<_Tp> ref(reference_wrapper<_Tp> __t) _NOEXCEPT {
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return __t;
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}
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<const _Tp> cref(const _Tp& __t) _NOEXCEPT {
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return reference_wrapper<const _Tp>(__t);
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}
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<const _Tp> cref(reference_wrapper<_Tp> __t) _NOEXCEPT {
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return __t;
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}
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template <class _Tp>
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void ref(const _Tp&&) = delete;
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template <class _Tp>
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void cref(const _Tp&&) = delete;
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CXX03___FUNCTIONAL_REFERENCE_WRAPPER_H
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