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___RANGES_DATA_H 11 #define _LIBCPP___RANGES_DATA_H 12 13 #include <__concepts/class_or_enum.h> 14 #include <__config> 15 #include <__iterator/concepts.h> 16 #include <__iterator/iterator_traits.h> 17 #include <__memory/pointer_traits.h> 18 #include <__ranges/access.h> 19 #include <__type_traits/decay.h> 20 #include <__type_traits/is_object.h> 21 #include <__type_traits/is_pointer.h> 22 #include <__type_traits/is_reference.h> 23 #include <__type_traits/remove_pointer.h> 24 #include <__type_traits/remove_reference.h> 25 #include <__utility/auto_cast.h> 26 27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 28 # pragma GCC system_header 29 #endif 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 #if _LIBCPP_STD_VER >= 20 34 35 // [range.prim.data] 36 37 namespace ranges { 38 namespace __data { 39 template <class _Tp> 40 concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>; 41 42 template <class _Tp> 43 concept __member_data = 44 __can_borrow<_Tp> && 45 __workaround_52970<_Tp> && 46 requires(_Tp&& __t) { 47 { _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object; 48 }; 49 50 template <class _Tp> 51 concept __ranges_begin_invocable = 52 !__member_data<_Tp> && 53 __can_borrow<_Tp> && 54 requires(_Tp&& __t) { 55 { ranges::begin(__t) } -> contiguous_iterator; 56 }; 57 58 struct __fn { 59 template <__member_data _Tp> 60 _LIBCPP_HIDE_FROM_ABI 61 constexpr auto operator()(_Tp&& __t) const 62 noexcept(noexcept(__t.data())) { 63 return __t.data(); 64 } 65 66 template<__ranges_begin_invocable _Tp> 67 _LIBCPP_HIDE_FROM_ABI 68 constexpr auto operator()(_Tp&& __t) const 69 noexcept(noexcept(std::to_address(ranges::begin(__t)))) { 70 return std::to_address(ranges::begin(__t)); 71 } 72 }; 73 } // namespace __data 74 75 inline namespace __cpo { 76 inline constexpr auto data = __data::__fn{}; 77 } // namespace __cpo 78 } // namespace ranges 79 80 // [range.prim.cdata] 81 82 namespace ranges { 83 namespace __cdata { 84 struct __fn { 85 template <class _Tp> 86 requires is_lvalue_reference_v<_Tp&&> 87 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI 88 constexpr auto operator()(_Tp&& __t) const 89 noexcept(noexcept(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t)))) 90 -> decltype( ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))) 91 { return ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t)); } 92 93 template <class _Tp> 94 requires is_rvalue_reference_v<_Tp&&> 95 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI 96 constexpr auto operator()(_Tp&& __t) const 97 noexcept(noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) 98 -> decltype( ranges::data(static_cast<const _Tp&&>(__t))) 99 { return ranges::data(static_cast<const _Tp&&>(__t)); } 100 }; 101 } // namespace __cdata 102 103 inline namespace __cpo { 104 inline constexpr auto cdata = __cdata::__fn{}; 105 } // namespace __cpo 106 } // namespace ranges 107 108 #endif // _LIBCPP_STD_VER >= 20 109 110 _LIBCPP_END_NAMESPACE_STD 111 112 #endif // _LIBCPP___RANGES_DATA_H 113