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_REMOVE_IF_H
10#define _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
11#include <__config>
12
13#include <__algorithm/ranges_find_if.h>
14#include <__functional/identity.h>
15#include <__functional/invoke.h>
16#include <__functional/ranges_operations.h>
17#include <__iterator/concepts.h>
18#include <__iterator/iter_move.h>
19#include <__iterator/permutable.h>
20#include <__iterator/projected.h>
21#include <__ranges/access.h>
22#include <__ranges/concepts.h>
23#include <__ranges/subrange.h>
24#include <__utility/move.h>
25
26#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
27#  pragma GCC system_header
28#endif
29
30_LIBCPP_PUSH_MACROS
31#include <__undef_macros>
32
33#if _LIBCPP_STD_VER >= 20
34
35_LIBCPP_BEGIN_NAMESPACE_STD
36
37namespace ranges {
38
39template <class _Iter, class _Sent, class _Proj, class _Pred>
40_LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
41__remove_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
42  auto __new_end = ranges::__find_if_impl(__first, __last, __pred, __proj);
43  if (__new_end == __last)
44    return {__new_end, __new_end};
45
46  _Iter __i = __new_end;
47  while (++__i != __last) {
48    if (!std::invoke(__pred, std::invoke(__proj, *__i))) {
49      *__new_end = ranges::iter_move(__i);
50      ++__new_end;
51    }
52  }
53  return {__new_end, __i};
54}
55
56struct __remove_if {
57  template <permutable _Iter,
58            sentinel_for<_Iter> _Sent,
59            class _Proj = identity,
60            indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
61  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
62  operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
63    return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
64  }
65
66  template <forward_range _Range,
67            class _Proj = identity,
68            indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
69    requires permutable<iterator_t<_Range>>
70  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
71  operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
72    return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
73  }
74};
75
76inline namespace __cpo {
77inline constexpr auto remove_if = __remove_if{};
78} // namespace __cpo
79} // namespace ranges
80
81_LIBCPP_END_NAMESPACE_STD
82
83#endif // _LIBCPP_STD_VER >= 20
84
85_LIBCPP_POP_MACROS
86
87#endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H