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
37namespace ranges {
38namespace __data {
39template <class _Tp>
40concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>;
41
42template <class _Tp>
43concept __member_data = __can_borrow<_Tp> && requires(_Tp&& __t) {
44 { _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object;
45};
46
47template <class _Tp>
48concept __ranges_begin_invocable = !__member_data<_Tp> && __can_borrow<_Tp> && requires(_Tp&& __t) {
49 { ranges::begin(__t) } -> contiguous_iterator;
50};
51
52struct __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
66inline namespace __cpo {
67inline constexpr auto data = __data::__fn{};
68} // namespace __cpo
69} // namespace ranges
70
71// [range.prim.cdata]
72
73namespace ranges {
74namespace __cdata {
75struct __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 noexcept(
87 noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::data(static_cast<const _Tp&&>(__t))) {
88 return ranges::data(static_cast<const _Tp&&>(__t));
89 }
90};
91} // namespace __cdata
92
93inline namespace __cpo {
94inline constexpr auto cdata = __cdata::__fn{};
95} // namespace __cpo
96} // namespace ranges
97
98#endif // _LIBCPP_STD_VER >= 20
99
100_LIBCPP_END_NAMESPACE_STD
101
102#endif // _LIBCPP___RANGES_DATA_H
103