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_FIND_FIRST_OF_H
10#define _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H
11
12#include <__config>
13#include <__functional/identity.h>
14#include <__functional/invoke.h>
15#include <__functional/ranges_operations.h>
16#include <__iterator/concepts.h>
17#include <__iterator/indirectly_comparable.h>
18#include <__ranges/access.h>
19#include <__ranges/concepts.h>
20#include <__ranges/dangling.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#if _LIBCPP_STD_VER > 17
28
29_LIBCPP_BEGIN_NAMESPACE_STD
30
31namespace ranges {
32namespace __find_first_of {
33struct __fn {
34
35  template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
36  _LIBCPP_HIDE_FROM_ABI constexpr static
37  _Iter1 __find_first_of_impl(_Iter1 __first1, _Sent1 __last1,
38                              _Iter2 __first2, _Sent2 __last2,
39                              _Pred& __pred,
40                              _Proj1& __proj1,
41                              _Proj2& __proj2) {
42    for (; __first1 != __last1; ++__first1) {
43      for (auto __j = __first2; __j != __last2; ++__j) {
44        if (std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__j)))
45          return __first1;
46      }
47    }
48    return __first1;
49  }
50
51  template <input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
52            forward_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
53            class _Pred = ranges::equal_to,
54            class _Proj1 = identity,
55            class _Proj2 = identity>
56    requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
57  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
58  _Iter1 operator()(_Iter1 __first1, _Sent1 __last1,
59                    _Iter2 __first2, _Sent2 __last2,
60                    _Pred __pred = {},
61                    _Proj1 __proj1 = {},
62                    _Proj2 __proj2 = {}) const {
63    return __find_first_of_impl(std::move(__first1), std::move(__last1),
64                                std::move(__first2), std::move(__last2),
65                                __pred,
66                                __proj1,
67                                __proj2);
68  }
69
70  template <input_range _Range1,
71            forward_range _Range2,
72            class _Pred = ranges::equal_to,
73            class _Proj1 = identity,
74            class _Proj2 = identity>
75    requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
76  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
77  borrowed_iterator_t<_Range1> operator()(_Range1&& __range1,
78                                          _Range2&& __range2,
79                                          _Pred __pred = {},
80                                          _Proj1 __proj1 = {},
81                                          _Proj2 __proj2 = {}) const {
82    return __find_first_of_impl(ranges::begin(__range1), ranges::end(__range1),
83                                ranges::begin(__range2), ranges::end(__range2),
84                                __pred,
85                                __proj1,
86                                __proj2);
87  }
88
89};
90} // namespace __find_first_of
91
92inline namespace __cpo {
93  inline constexpr auto find_first_of = __find_first_of::__fn{};
94} // namespace __cpo
95} // namespace ranges
96
97_LIBCPP_END_NAMESPACE_STD
98
99#endif // _LIBCPP_STD_VER > 17
100
101#endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H
102