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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___FUNCTIONAL_REFERENCE_WRAPPER_H |
| 11 | #define _LIBCPP___CXX03___FUNCTIONAL_REFERENCE_WRAPPER_H |
| 12 | |
| 13 | #include <__cxx03/__config> |
| 14 | #include <__cxx03/__functional/weak_result_type.h> |
| 15 | #include <__cxx03/__memory/addressof.h> |
| 16 | #include <__cxx03/__type_traits/enable_if.h> |
| 17 | #include <__cxx03/__type_traits/invoke.h> |
| 18 | #include <__cxx03/__type_traits/is_const.h> |
| 19 | #include <__cxx03/__type_traits/remove_cvref.h> |
| 20 | #include <__cxx03/__type_traits/void_t.h> |
| 21 | #include <__cxx03/__utility/declval.h> |
| 22 | #include <__cxx03/__utility/forward.h> |
| 23 | |
| 24 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 25 | # pragma GCC system_header |
| 26 | #endif |
| 27 | |
| 28 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 29 | |
| 30 | template <class _Tp> |
| 31 | class _LIBCPP_TEMPLATE_VIS reference_wrapper : public __weak_result_type<_Tp> { |
| 32 | public: |
| 33 | // types |
| 34 | typedef _Tp type; |
| 35 | |
| 36 | private: |
| 37 | type* __f_; |
| 38 | |
| 39 | static void __fun(_Tp&) _NOEXCEPT; |
| 40 | static void __fun(_Tp&&) = delete; // NOLINT(modernize-use-equals-delete) ; This is llvm.org/PR54276 |
| 41 | |
| 42 | public: |
| 43 | template <class _Up, |
| 44 | class = __void_t<decltype(__fun(std::declval<_Up>()))>, |
| 45 | __enable_if_t<!__is_same_uncvref<_Up, reference_wrapper>::value, int> = 0> |
| 46 | _LIBCPP_HIDE_FROM_ABI reference_wrapper(_Up&& __u) { |
| 47 | type& __f = static_cast<_Up&&>(__u); |
| 48 | __f_ = std::addressof(__f); |
| 49 | } |
| 50 | |
| 51 | // access |
| 52 | _LIBCPP_HIDE_FROM_ABI operator type&() const _NOEXCEPT { return *__f_; } |
| 53 | _LIBCPP_HIDE_FROM_ABI type& get() const _NOEXCEPT { return *__f_; } |
| 54 | |
| 55 | // invoke |
| 56 | template <class... _ArgTypes> |
| 57 | _LIBCPP_HIDE_FROM_ABI typename __invoke_of<type&, _ArgTypes...>::type operator()(_ArgTypes&&... __args) const { |
| 58 | return std::__invoke(get(), std::forward<_ArgTypes>(__args)...); |
| 59 | } |
| 60 | }; |
| 61 | |
| 62 | template <class _Tp> |
| 63 | inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<_Tp> ref(_Tp& __t) _NOEXCEPT { |
| 64 | return reference_wrapper<_Tp>(__t); |
| 65 | } |
| 66 | |
| 67 | template <class _Tp> |
| 68 | inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<_Tp> ref(reference_wrapper<_Tp> __t) _NOEXCEPT { |
| 69 | return __t; |
| 70 | } |
| 71 | |
| 72 | template <class _Tp> |
| 73 | inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<const _Tp> cref(const _Tp& __t) _NOEXCEPT { |
| 74 | return reference_wrapper<const _Tp>(__t); |
| 75 | } |
| 76 | |
| 77 | template <class _Tp> |
| 78 | inline _LIBCPP_HIDE_FROM_ABI reference_wrapper<const _Tp> cref(reference_wrapper<_Tp> __t) _NOEXCEPT { |
| 79 | return __t; |
| 80 | } |
| 81 | |
| 82 | template <class _Tp> |
| 83 | void ref(const _Tp&&) = delete; |
| 84 | template <class _Tp> |
| 85 | void cref(const _Tp&&) = delete; |
| 86 | |
| 87 | _LIBCPP_END_NAMESPACE_STD |
| 88 | |
| 89 | #endif // _LIBCPP___CXX03___FUNCTIONAL_REFERENCE_WRAPPER_H |
| 90 |
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