xref: /freebsd-src/contrib/llvm-project/libcxx/include/__algorithm/ranges_remove_if.h (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583)
1753f127fSDimitry Andric //===----------------------------------------------------------------------===//
2753f127fSDimitry Andric //
3753f127fSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4753f127fSDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
5753f127fSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6753f127fSDimitry Andric //
7753f127fSDimitry Andric //===----------------------------------------------------------------------===//
8753f127fSDimitry Andric 
9753f127fSDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
10753f127fSDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
11753f127fSDimitry Andric #include <__config>
12753f127fSDimitry Andric 
13753f127fSDimitry Andric #include <__algorithm/ranges_find_if.h>
14753f127fSDimitry Andric #include <__functional/identity.h>
15753f127fSDimitry Andric #include <__functional/invoke.h>
16753f127fSDimitry Andric #include <__functional/ranges_operations.h>
17753f127fSDimitry Andric #include <__iterator/concepts.h>
18753f127fSDimitry Andric #include <__iterator/iter_move.h>
19753f127fSDimitry Andric #include <__iterator/permutable.h>
20753f127fSDimitry Andric #include <__iterator/projected.h>
21753f127fSDimitry Andric #include <__ranges/access.h>
22753f127fSDimitry Andric #include <__ranges/concepts.h>
23753f127fSDimitry Andric #include <__ranges/subrange.h>
24753f127fSDimitry Andric #include <__utility/move.h>
25753f127fSDimitry Andric 
26753f127fSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
27753f127fSDimitry Andric #  pragma GCC system_header
28753f127fSDimitry Andric #endif
29753f127fSDimitry Andric 
30b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS
31b3edf446SDimitry Andric #include <__undef_macros>
32b3edf446SDimitry Andric 
3306c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20
34753f127fSDimitry Andric 
35753f127fSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
36753f127fSDimitry Andric 
37753f127fSDimitry Andric namespace ranges {
38753f127fSDimitry Andric 
39753f127fSDimitry Andric template <class _Iter, class _Sent, class _Proj, class _Pred>
4006c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
4106c3fb27SDimitry Andric __remove_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
42753f127fSDimitry Andric   auto __new_end = ranges::__find_if_impl(__first, __last, __pred, __proj);
43753f127fSDimitry Andric   if (__new_end == __last)
44753f127fSDimitry Andric     return {__new_end, __new_end};
45753f127fSDimitry Andric 
46753f127fSDimitry Andric   _Iter __i = __new_end;
47753f127fSDimitry Andric   while (++__i != __last) {
48753f127fSDimitry Andric     if (!std::invoke(__pred, std::invoke(__proj, *__i))) {
49753f127fSDimitry Andric       *__new_end = ranges::iter_move(__i);
50753f127fSDimitry Andric       ++__new_end;
51753f127fSDimitry Andric     }
52753f127fSDimitry Andric   }
53753f127fSDimitry Andric   return {__new_end, __i};
54753f127fSDimitry Andric }
55753f127fSDimitry Andric 
56753f127fSDimitry Andric namespace __remove_if {
57753f127fSDimitry Andric struct __fn {
5806c3fb27SDimitry Andric   template <permutable _Iter,
5906c3fb27SDimitry Andric             sentinel_for<_Iter> _Sent,
60753f127fSDimitry Andric             class _Proj = identity,
61753f127fSDimitry Andric             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
62*0fca6ea1SDimitry Andric   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
6306c3fb27SDimitry Andric   operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
64753f127fSDimitry Andric     return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
65753f127fSDimitry Andric   }
66753f127fSDimitry Andric 
67753f127fSDimitry Andric   template <forward_range _Range,
68753f127fSDimitry Andric             class _Proj = identity,
69753f127fSDimitry Andric             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
70753f127fSDimitry Andric     requires permutable<iterator_t<_Range>>
71*0fca6ea1SDimitry Andric   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
7206c3fb27SDimitry Andric   operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
73753f127fSDimitry Andric     return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
74753f127fSDimitry Andric   }
75753f127fSDimitry Andric };
76753f127fSDimitry Andric } // namespace __remove_if
77753f127fSDimitry Andric 
78753f127fSDimitry Andric inline namespace __cpo {
79753f127fSDimitry Andric inline constexpr auto remove_if = __remove_if::__fn{};
80753f127fSDimitry Andric } // namespace __cpo
81753f127fSDimitry Andric } // namespace ranges
82753f127fSDimitry Andric 
83753f127fSDimitry Andric _LIBCPP_END_NAMESPACE_STD
84753f127fSDimitry Andric 
8506c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20
86753f127fSDimitry Andric 
87b3edf446SDimitry Andric _LIBCPP_POP_MACROS
88b3edf446SDimitry Andric 
89753f127fSDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
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