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_H
10 #define _LIBCPP___ALGORITHM_RANGES_REMOVE_H
11 #include <__config>
12 
13 #include <__algorithm/ranges_remove_if.h>
14 #include <__functional/identity.h>
15 #include <__functional/ranges_operations.h>
16 #include <__iterator/concepts.h>
17 #include <__iterator/permutable.h>
18 #include <__iterator/projected.h>
19 #include <__ranges/access.h>
20 #include <__ranges/concepts.h>
21 #include <__ranges/subrange.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 #if _LIBCPP_STD_VER >= 20
29 
30 _LIBCPP_BEGIN_NAMESPACE_STD
31 
32 namespace ranges {
33 namespace __remove {
34 struct __fn {
35   template <permutable _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
36     requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
37   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
38   operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const {
39     auto __pred = [&](auto&& __other) -> bool { return __value == __other; };
40     return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
41   }
42 
43   template <forward_range _Range, class _Type, class _Proj = identity>
44     requires permutable<iterator_t<_Range>> &&
45              indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
46   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
47   operator()(_Range&& __range, const _Type& __value, _Proj __proj = {}) const {
48     auto __pred = [&](auto&& __other) -> bool { return __value == __other; };
49     return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
50   }
51 };
52 } // namespace __remove
53 
54 inline namespace __cpo {
55 inline constexpr auto remove = __remove::__fn{};
56 } // namespace __cpo
57 } // namespace ranges
58 
59 _LIBCPP_END_NAMESPACE_STD
60 
61 #endif // _LIBCPP_STD_VER >= 20
62 
63 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_H
64