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_COPY_IF_H
10#define _LIBCPP___ALGORITHM_RANGES_COPY_IF_H
11
12#include <__algorithm/in_out_result.h>
13#include <__config>
14#include <__functional/identity.h>
15#include <__functional/invoke.h>
16#include <__iterator/concepts.h>
17#include <__iterator/projected.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 {
32
33template<class _Ip, class _Op>
34using copy_if_result = in_out_result<_Ip, _Op>;
35
36namespace __copy_if {
37struct __fn {
38
39  template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred>
40  _LIBCPP_HIDE_FROM_ABI static constexpr
41  copy_if_result <_InIter, _OutIter>
42  __copy_if_impl(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) {
43    for (; __first != __last; ++__first) {
44      if (std::invoke(__pred, std::invoke(__proj, *__first))) {
45        *__result = *__first;
46        ++__result;
47      }
48    }
49    return {std::move(__first), std::move(__result)};
50  }
51
52  template <input_iterator _Iter, sentinel_for<_Iter> _Sent, weakly_incrementable _OutIter, class _Proj = identity,
53            indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
54    requires indirectly_copyable<_Iter, _OutIter>
55  _LIBCPP_HIDE_FROM_ABI constexpr
56  copy_if_result<_Iter, _OutIter>
57  operator()(_Iter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
58    return __copy_if_impl(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
59  }
60
61  template <input_range _Range, weakly_incrementable _OutIter, class _Proj = identity,
62            indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
63    requires indirectly_copyable<iterator_t<_Range>, _OutIter>
64  _LIBCPP_HIDE_FROM_ABI constexpr
65  copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
66  operator()(_Range&& __r, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
67    return __copy_if_impl(ranges::begin(__r), ranges::end(__r), std::move(__result), __pred, __proj);
68  }
69};
70} // namespace __copy_if
71
72inline namespace __cpo {
73  inline constexpr auto copy_if = __copy_if::__fn{};
74} // namespace __cpo
75} // namespace ranges
76
77_LIBCPP_END_NAMESPACE_STD
78
79#endif // _LIBCPP_STD_VER > 17
80
81#endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H
82