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 = __can_borrow<_Tp> && __workaround_52970<_Tp> && requires(_Tp&& __t) { 44 { _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object; 45 }; 46 47 template <class _Tp> 48 concept __ranges_begin_invocable = !__member_data<_Tp> && __can_borrow<_Tp> && requires(_Tp&& __t) { 49 { ranges::begin(__t) } -> contiguous_iterator; 50 }; 51 52 struct __fn { 53 template <__member_data _Tp> 54 _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(noexcept(__t.data())) { 55 return __t.data(); 56 } 57 58 template <__ranges_begin_invocable _Tp> 59 _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 60 noexcept(noexcept(std::to_address(ranges::begin(__t)))) { 61 return std::to_address(ranges::begin(__t)); 62 } 63 }; 64 } // namespace __data 65 66 inline namespace __cpo { 67 inline constexpr auto data = __data::__fn{}; 68 } // namespace __cpo 69 } // namespace ranges 70 71 // [range.prim.cdata] 72 73 namespace ranges { 74 namespace __cdata { 75 struct __fn { 76 template <class _Tp> 77 requires is_lvalue_reference_v<_Tp&&> 78 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 79 noexcept(noexcept(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t)))) 80 -> decltype(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))) { 81 return ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t)); 82 } 83 84 template <class _Tp> 85 requires is_rvalue_reference_v<_Tp&&> 86 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 87 noexcept(noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) 88 -> decltype(ranges::data(static_cast<const _Tp&&>(__t))) { 89 return ranges::data(static_cast<const _Tp&&>(__t)); 90 } 91 }; 92 } // namespace __cdata 93 94 inline namespace __cpo { 95 inline constexpr auto cdata = __cdata::__fn{}; 96 } // namespace __cpo 97 } // namespace ranges 98 99 #endif // _LIBCPP_STD_VER >= 20 100 101 _LIBCPP_END_NAMESPACE_STD 102 103 #endif // _LIBCPP___RANGES_DATA_H 104