1*4bdff4beSrobert //===----------------------------------------------------------------------===//
2*4bdff4beSrobert //
3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*4bdff4beSrobert //
7*4bdff4beSrobert //===----------------------------------------------------------------------===//
8*4bdff4beSrobert
9*4bdff4beSrobert #ifndef _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
10*4bdff4beSrobert #define _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
11*4bdff4beSrobert #include <__config>
12*4bdff4beSrobert
13*4bdff4beSrobert #include <__algorithm/ranges_find_if.h>
14*4bdff4beSrobert #include <__functional/identity.h>
15*4bdff4beSrobert #include <__functional/invoke.h>
16*4bdff4beSrobert #include <__functional/ranges_operations.h>
17*4bdff4beSrobert #include <__iterator/concepts.h>
18*4bdff4beSrobert #include <__iterator/iter_move.h>
19*4bdff4beSrobert #include <__iterator/permutable.h>
20*4bdff4beSrobert #include <__iterator/projected.h>
21*4bdff4beSrobert #include <__ranges/access.h>
22*4bdff4beSrobert #include <__ranges/concepts.h>
23*4bdff4beSrobert #include <__ranges/subrange.h>
24*4bdff4beSrobert #include <__utility/move.h>
25*4bdff4beSrobert
26*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
27*4bdff4beSrobert # pragma GCC system_header
28*4bdff4beSrobert #endif
29*4bdff4beSrobert
30*4bdff4beSrobert #if _LIBCPP_STD_VER > 17
31*4bdff4beSrobert
32*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
33*4bdff4beSrobert
34*4bdff4beSrobert namespace ranges {
35*4bdff4beSrobert
36*4bdff4beSrobert template <class _Iter, class _Sent, class _Proj, class _Pred>
37*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI constexpr
__remove_if_impl(_Iter __first,_Sent __last,_Pred & __pred,_Proj & __proj)38*4bdff4beSrobert subrange<_Iter> __remove_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
39*4bdff4beSrobert auto __new_end = ranges::__find_if_impl(__first, __last, __pred, __proj);
40*4bdff4beSrobert if (__new_end == __last)
41*4bdff4beSrobert return {__new_end, __new_end};
42*4bdff4beSrobert
43*4bdff4beSrobert _Iter __i = __new_end;
44*4bdff4beSrobert while (++__i != __last) {
45*4bdff4beSrobert if (!std::invoke(__pred, std::invoke(__proj, *__i))) {
46*4bdff4beSrobert *__new_end = ranges::iter_move(__i);
47*4bdff4beSrobert ++__new_end;
48*4bdff4beSrobert }
49*4bdff4beSrobert }
50*4bdff4beSrobert return {__new_end, __i};
51*4bdff4beSrobert }
52*4bdff4beSrobert
53*4bdff4beSrobert namespace __remove_if {
54*4bdff4beSrobert struct __fn {
55*4bdff4beSrobert
56*4bdff4beSrobert template <permutable _Iter, sentinel_for<_Iter> _Sent,
57*4bdff4beSrobert class _Proj = identity,
58*4bdff4beSrobert indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
59*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn60*4bdff4beSrobert subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
61*4bdff4beSrobert return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
62*4bdff4beSrobert }
63*4bdff4beSrobert
64*4bdff4beSrobert template <forward_range _Range,
65*4bdff4beSrobert class _Proj = identity,
66*4bdff4beSrobert indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
67*4bdff4beSrobert requires permutable<iterator_t<_Range>>
68*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn69*4bdff4beSrobert borrowed_subrange_t<_Range> operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
70*4bdff4beSrobert return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
71*4bdff4beSrobert }
72*4bdff4beSrobert
73*4bdff4beSrobert };
74*4bdff4beSrobert } // namespace __remove_if
75*4bdff4beSrobert
76*4bdff4beSrobert inline namespace __cpo {
77*4bdff4beSrobert inline constexpr auto remove_if = __remove_if::__fn{};
78*4bdff4beSrobert } // namespace __cpo
79*4bdff4beSrobert } // namespace ranges
80*4bdff4beSrobert
81*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
82*4bdff4beSrobert
83*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17
84*4bdff4beSrobert
85*4bdff4beSrobert #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
86