| // -*- 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_REFERENCE_WRAPPER_H |
| #define _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H |
| |
| #include <__config> |
| #include <__functional/weak_result_type.h> |
| #include <__memory/addressof.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 _LIBCPP_TEMPLATE_VIS reference_wrapper |
| #if _LIBCPP_STD_VER <= 17 || !defined(_LIBCPP_ABI_NO_BINDER_BASES) |
| : public __weak_result_type<_Tp> |
| #endif |
| { |
| public: |
| // types |
| typedef _Tp type; |
| private: |
| type* __f_; |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| static void __fun(_Tp&) _NOEXCEPT; |
| static void __fun(_Tp&&) = delete; |
| #endif |
| |
| public: |
| // construct/copy/destroy |
| #ifdef _LIBCPP_CXX03_LANG |
| _LIBCPP_INLINE_VISIBILITY |
| reference_wrapper(type& __f) _NOEXCEPT |
| : __f_(_VSTD::addressof(__f)) {} |
| #else |
| template <class _Up, class = __enable_if_t<!__is_same_uncvref<_Up, reference_wrapper>::value, decltype(__fun(declval<_Up>())) >> |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| reference_wrapper(_Up&& __u) _NOEXCEPT_(noexcept(__fun(declval<_Up>()))) { |
| type& __f = static_cast<_Up&&>(__u); |
| __f_ = _VSTD::addressof(__f); |
| } |
| #endif |
| |
| // access |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| operator type&() const _NOEXCEPT {return *__f_;} |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| type& get() const _NOEXCEPT {return *__f_;} |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| // invoke |
| template <class... _ArgTypes> |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| typename __invoke_of<type&, _ArgTypes...>::type |
| operator() (_ArgTypes&&... __args) const { |
| return _VSTD::__invoke(get(), _VSTD::forward<_ArgTypes>(__args)...); |
| } |
| #else |
| |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return<type>::type |
| operator() () const { |
| return _VSTD::__invoke(get()); |
| } |
| |
| template <class _A0> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return0<type, _A0>::type |
| operator() (_A0& __a0) const { |
| return _VSTD::__invoke(get(), __a0); |
| } |
| |
| template <class _A0> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return0<type, _A0 const>::type |
| operator() (_A0 const& __a0) const { |
| return _VSTD::__invoke(get(), __a0); |
| } |
| |
| template <class _A0, class _A1> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return1<type, _A0, _A1>::type |
| operator() (_A0& __a0, _A1& __a1) const { |
| return _VSTD::__invoke(get(), __a0, __a1); |
| } |
| |
| template <class _A0, class _A1> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return1<type, _A0 const, _A1>::type |
| operator() (_A0 const& __a0, _A1& __a1) const { |
| return _VSTD::__invoke(get(), __a0, __a1); |
| } |
| |
| template <class _A0, class _A1> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return1<type, _A0, _A1 const>::type |
| operator() (_A0& __a0, _A1 const& __a1) const { |
| return _VSTD::__invoke(get(), __a0, __a1); |
| } |
| |
| template <class _A0, class _A1> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return1<type, _A0 const, _A1 const>::type |
| operator() (_A0 const& __a0, _A1 const& __a1) const { |
| return _VSTD::__invoke(get(), __a0, __a1); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0, _A1, _A2>::type |
| operator() (_A0& __a0, _A1& __a1, _A2& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0 const, _A1, _A2>::type |
| operator() (_A0 const& __a0, _A1& __a1, _A2& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0, _A1 const, _A2>::type |
| operator() (_A0& __a0, _A1 const& __a1, _A2& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0, _A1, _A2 const>::type |
| operator() (_A0& __a0, _A1& __a1, _A2 const& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0 const, _A1 const, _A2>::type |
| operator() (_A0 const& __a0, _A1 const& __a1, _A2& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0 const, _A1, _A2 const>::type |
| operator() (_A0 const& __a0, _A1& __a1, _A2 const& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0, _A1 const, _A2 const>::type |
| operator() (_A0& __a0, _A1 const& __a1, _A2 const& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| |
| template <class _A0, class _A1, class _A2> |
| _LIBCPP_INLINE_VISIBILITY |
| typename __invoke_return2<type, _A0 const, _A1 const, _A2 const>::type |
| operator() (_A0 const& __a0, _A1 const& __a1, _A2 const& __a2) const { |
| return _VSTD::__invoke(get(), __a0, __a1, __a2); |
| } |
| #endif // _LIBCPP_CXX03_LANG |
| }; |
| |
| #if _LIBCPP_STD_VER >= 17 |
| template <class _Tp> |
| reference_wrapper(_Tp&) -> reference_wrapper<_Tp>; |
| #endif |
| |
| template <class _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| reference_wrapper<_Tp> |
| ref(_Tp& __t) _NOEXCEPT |
| { |
| return reference_wrapper<_Tp>(__t); |
| } |
| |
| template <class _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| reference_wrapper<_Tp> |
| ref(reference_wrapper<_Tp> __t) _NOEXCEPT |
| { |
| return _VSTD::ref(__t.get()); |
| } |
| |
| template <class _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| reference_wrapper<const _Tp> |
| cref(const _Tp& __t) _NOEXCEPT |
| { |
| return reference_wrapper<const _Tp>(__t); |
| } |
| |
| template <class _Tp> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| reference_wrapper<const _Tp> |
| cref(reference_wrapper<_Tp> __t) _NOEXCEPT |
| { |
| return _VSTD::cref(__t.get()); |
| } |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| template <class _Tp> void ref(const _Tp&&) = delete; |
| template <class _Tp> void cref(const _Tp&&) = delete; |
| #endif |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H |
