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 #if _LIBCPP_STD_VER > 17
31
32 _LIBCPP_BEGIN_NAMESPACE_STD
33
34 namespace ranges {
35
36 template <class _Iter, class _Sent, class _Proj, class _Pred>
37 _LIBCPP_HIDE_FROM_ABI constexpr
__remove_if_impl(_Iter __first,_Sent __last,_Pred & __pred,_Proj & __proj)38 subrange<_Iter> __remove_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
39 auto __new_end = ranges::__find_if_impl(__first, __last, __pred, __proj);
40 if (__new_end == __last)
41 return {__new_end, __new_end};
42
43 _Iter __i = __new_end;
44 while (++__i != __last) {
45 if (!std::invoke(__pred, std::invoke(__proj, *__i))) {
46 *__new_end = ranges::iter_move(__i);
47 ++__new_end;
48 }
49 }
50 return {__new_end, __i};
51 }
52
53 namespace __remove_if {
54 struct __fn {
55
56 template <permutable _Iter, sentinel_for<_Iter> _Sent,
57 class _Proj = identity,
58 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
59 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn60 subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
61 return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
62 }
63
64 template <forward_range _Range,
65 class _Proj = identity,
66 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
67 requires permutable<iterator_t<_Range>>
68 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn69 borrowed_subrange_t<_Range> operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
70 return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
71 }
72
73 };
74 } // namespace __remove_if
75
76 inline namespace __cpo {
77 inline constexpr auto remove_if = __remove_if::__fn{};
78 } // namespace __cpo
79 } // namespace ranges
80
81 _LIBCPP_END_NAMESPACE_STD
82
83 #endif // _LIBCPP_STD_VER > 17
84
85 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
86