368faacac7
This commit reverts5aaefa51(and also partly7f285f48e7andb6d75682f9, which were related to the original commit). As landed,5aaefa51had 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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