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/copy_if.h>
13#include <__algorithm/in_out_result.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__functional/invoke.h>
17#include <__iterator/concepts.h>
18#include <__iterator/projected.h>
19#include <__ranges/access.h>
20#include <__ranges/concepts.h>
21#include <__ranges/dangling.h>
22#include <__utility/move.h>
23
24#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25#  pragma GCC system_header
26#endif
27
28_LIBCPP_PUSH_MACROS
29#include <__undef_macros>
30
31#if _LIBCPP_STD_VER >= 20
32
33_LIBCPP_BEGIN_NAMESPACE_STD
34
35namespace ranges {
36
37template <class _Ip, class _Op>
38using copy_if_result = in_out_result<_Ip, _Op>;
39
40struct __copy_if {
41  template <input_iterator _Iter,
42            sentinel_for<_Iter> _Sent,
43            weakly_incrementable _OutIter,
44            class _Proj = identity,
45            indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
46    requires indirectly_copyable<_Iter, _OutIter>
47  _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<_Iter, _OutIter>
48  operator()(_Iter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
49    auto __res = std::__copy_if(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
50    return {std::move(__res.first), std::move(__res.second)};
51  }
52
53  template <input_range _Range,
54            weakly_incrementable _OutIter,
55            class _Proj = identity,
56            indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
57    requires indirectly_copyable<iterator_t<_Range>, _OutIter>
58  _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
59  operator()(_Range&& __r, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
60    auto __res = std::__copy_if(ranges::begin(__r), ranges::end(__r), std::move(__result), __pred, __proj);
61    return {std::move(__res.first), std::move(__res.second)};
62  }
63};
64
65inline namespace __cpo {
66inline constexpr auto copy_if = __copy_if{};
67} // namespace __cpo
68} // namespace ranges
69
70_LIBCPP_END_NAMESPACE_STD
71
72#endif // _LIBCPP_STD_VER >= 20
73
74_LIBCPP_POP_MACROS
75
76#endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H