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_H
10#define _LIBCPP___ALGORITHM_RANGES_FIND_H
11
12#include <__algorithm/find.h>
13#include <__algorithm/ranges_find_if.h>
14#include <__algorithm/unwrap_range.h>
15#include <__config>
16#include <__functional/identity.h>
17#include <__functional/invoke.h>
18#include <__functional/ranges_operations.h>
19#include <__iterator/concepts.h>
20#include <__iterator/projected.h>
21#include <__ranges/access.h>
22#include <__ranges/concepts.h>
23#include <__ranges/dangling.h>
24#include <__utility/forward.h>
25#include <__utility/move.h>
26
27#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28# pragma GCC system_header
29#endif
30
31_LIBCPP_PUSH_MACROS
32#include <__undef_macros>
33
34#if _LIBCPP_STD_VER >= 20
35
36_LIBCPP_BEGIN_NAMESPACE_STD
37
38namespace ranges {
39struct __find {
40 template <class _Iter, class _Sent, class _Tp, class _Proj>
41 static constexpr _Iter __find_unwrap(_Iter __first, _Sent __last, const _Tp& __value, _Proj& __proj) {
42 if constexpr (forward_iterator<_Iter>) {
43 auto [__first_un, __last_un] = std::__unwrap_range(__first, std::move(__last));
44 return std::__rewrap_range<_Sent>(
45 std::move(__first), std::__find(std::move(__first_un), std::move(__last_un), __value, __proj));
46 } else {
47 return std::__find(std::move(__first), std::move(__last), __value, __proj);
48 }
49 }
50
51 template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, class _Proj = identity>
52 requires indirect_binary_predicate<ranges::equal_to, projected<_Ip, _Proj>, const _Tp*>
53 [[nodiscard]] constexpr _Ip operator()(_Ip __first, _Sp __last, const _Tp& __value, _Proj __proj = {}) const {
54 return __find_unwrap(std::move(__first), std::move(__last), __value, __proj);
55 }
56
57 template <input_range _Rp, class _Tp, class _Proj = identity>
58 requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Rp>, _Proj>, const _Tp*>
59 [[nodiscard]] constexpr borrowed_iterator_t<_Rp> operator()(_Rp&& __r, const _Tp& __value, _Proj __proj = {}) const {
60 return __find_unwrap(ranges::begin(__r), ranges::end(__r), __value, __proj);
61 }
62};
63
64inline namespace __cpo {
65inline constexpr auto find = __find{};
66} // namespace __cpo
67} // namespace ranges
68
69_LIBCPP_END_NAMESPACE_STD
70
71#endif // _LIBCPP_STD_VER >= 20
72
73_LIBCPP_POP_MACROS
74
75#endif // _LIBCPP___ALGORITHM_RANGES_FIND_H
76