368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
213 lines
6.5 KiB
C++
213 lines
6.5 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_REFERENCE_WRAPPER_H
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#define _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H
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#include <__config>
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#include <__functional/weak_result_type.h>
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#include <__memory/addressof.h>
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#include <__utility/forward.h>
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#include <type_traits>
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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
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#if _LIBCPP_STD_VER <= 17 || !defined(_LIBCPP_ABI_NO_BINDER_BASES)
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: public __weak_result_type<_Tp>
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#endif
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{
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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;
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public:
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template <class _Up, class = __enable_if_t<!__is_same_uncvref<_Up, reference_wrapper>::value, decltype(__fun(declval<_Up>())) > >
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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reference_wrapper(_Up&& __u) _NOEXCEPT_(noexcept(__fun(declval<_Up>()))) {
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type& __f = static_cast<_Up&&>(__u);
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__f_ = _VSTD::addressof(__f);
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}
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// access
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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operator type&() const _NOEXCEPT {return *__f_;}
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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type& get() const _NOEXCEPT {return *__f_;}
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#ifndef _LIBCPP_CXX03_LANG
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// invoke
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template <class... _ArgTypes>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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typename __invoke_of<type&, _ArgTypes...>::type
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operator() (_ArgTypes&&... __args) const {
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return _VSTD::__invoke(get(), _VSTD::forward<_ArgTypes>(__args)...);
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}
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#else
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return<type>::type
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operator() () const {
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return _VSTD::__invoke(get());
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}
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template <class _A0>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return0<type, _A0>::type
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operator() (_A0& __a0) const {
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return _VSTD::__invoke(get(), __a0);
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}
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template <class _A0>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return0<type, _A0 const>::type
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operator() (_A0 const& __a0) const {
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return _VSTD::__invoke(get(), __a0);
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}
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template <class _A0, class _A1>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return1<type, _A0, _A1>::type
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operator() (_A0& __a0, _A1& __a1) const {
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return _VSTD::__invoke(get(), __a0, __a1);
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}
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template <class _A0, class _A1>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return1<type, _A0 const, _A1>::type
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operator() (_A0 const& __a0, _A1& __a1) const {
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return _VSTD::__invoke(get(), __a0, __a1);
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}
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template <class _A0, class _A1>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return1<type, _A0, _A1 const>::type
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operator() (_A0& __a0, _A1 const& __a1) const {
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return _VSTD::__invoke(get(), __a0, __a1);
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}
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template <class _A0, class _A1>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return1<type, _A0 const, _A1 const>::type
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operator() (_A0 const& __a0, _A1 const& __a1) const {
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return _VSTD::__invoke(get(), __a0, __a1);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0, _A1, _A2>::type
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operator() (_A0& __a0, _A1& __a1, _A2& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0 const, _A1, _A2>::type
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operator() (_A0 const& __a0, _A1& __a1, _A2& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0, _A1 const, _A2>::type
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operator() (_A0& __a0, _A1 const& __a1, _A2& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0, _A1, _A2 const>::type
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operator() (_A0& __a0, _A1& __a1, _A2 const& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0 const, _A1 const, _A2>::type
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operator() (_A0 const& __a0, _A1 const& __a1, _A2& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0 const, _A1, _A2 const>::type
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operator() (_A0 const& __a0, _A1& __a1, _A2 const& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0, _A1 const, _A2 const>::type
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operator() (_A0& __a0, _A1 const& __a1, _A2 const& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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template <class _A0, class _A1, class _A2>
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_LIBCPP_INLINE_VISIBILITY
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typename __invoke_return2<type, _A0 const, _A1 const, _A2 const>::type
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operator() (_A0 const& __a0, _A1 const& __a1, _A2 const& __a2) const {
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return _VSTD::__invoke(get(), __a0, __a1, __a2);
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}
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#endif // _LIBCPP_CXX03_LANG
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};
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#if _LIBCPP_STD_VER > 14
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template <class _Tp>
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reference_wrapper(_Tp&) -> reference_wrapper<_Tp>;
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#endif
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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reference_wrapper<_Tp>
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ref(_Tp& __t) _NOEXCEPT
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{
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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_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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reference_wrapper<_Tp>
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ref(reference_wrapper<_Tp> __t) _NOEXCEPT
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{
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return __t;
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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reference_wrapper<const _Tp>
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cref(const _Tp& __t) _NOEXCEPT
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{
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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_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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reference_wrapper<const _Tp>
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cref(reference_wrapper<_Tp> __t) _NOEXCEPT
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{
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return __t;
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}
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template <class _Tp> void ref(const _Tp&&) = delete;
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template <class _Tp> void cref(const _Tp&&) = delete;
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H
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