1//===----------------------------------------------------------------------===//
 2//
 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4// See https://llvm.org/LICENSE.txt for license information.
 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6//
 7//===----------------------------------------------------------------------===//
 8
 9#ifndef _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
10#define _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
11
12#include <__algorithm/in_in_result.h>
13#include <__algorithm/ranges_mismatch.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__functional/ranges_operations.h>
17#include <__iterator/concepts.h>
18#include <__iterator/indirectly_comparable.h>
19#include <__ranges/access.h>
20#include <__ranges/concepts.h>
21#include <__utility/move.h>
22
23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24#  pragma GCC system_header
25#endif
26
27_LIBCPP_PUSH_MACROS
28#include <__undef_macros>
29
30#if _LIBCPP_STD_VER >= 23
31
32_LIBCPP_BEGIN_NAMESPACE_STD
33
34namespace ranges {
35struct __starts_with {
36  template <input_iterator _Iter1,
37            sentinel_for<_Iter1> _Sent1,
38            input_iterator _Iter2,
39            sentinel_for<_Iter2> _Sent2,
40            class _Pred  = ranges::equal_to,
41            class _Proj1 = identity,
42            class _Proj2 = identity>
43    requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
44  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool operator()(
45      _Iter1 __first1,
46      _Sent1 __last1,
47      _Iter2 __first2,
48      _Sent2 __last2,
49      _Pred __pred   = {},
50      _Proj1 __proj1 = {},
51      _Proj2 __proj2 = {}) {
52    return __mismatch::__go(
53               std::move(__first1),
54               std::move(__last1),
55               std::move(__first2),
56               std::move(__last2),
57               __pred,
58               __proj1,
59               __proj2)
60               .in2 == __last2;
61  }
62
63  template <input_range _Range1,
64            input_range _Range2,
65            class _Pred  = ranges::equal_to,
66            class _Proj1 = identity,
67            class _Proj2 = identity>
68    requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
69  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool
70  operator()(_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) {
71    return __mismatch::__go(
72               ranges::begin(__range1),
73               ranges::end(__range1),
74               ranges::begin(__range2),
75               ranges::end(__range2),
76               __pred,
77               __proj1,
78               __proj2)
79               .in2 == ranges::end(__range2);
80  }
81};
82inline namespace __cpo {
83inline constexpr auto starts_with = __starts_with{};
84} // namespace __cpo
85} // namespace ranges
86
87_LIBCPP_END_NAMESPACE_STD
88
89#endif // _LIBCPP_STD_VER >= 23
90
91_LIBCPP_POP_MACROS
92
93#endif // _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H