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_REPLACE_IF_H
10 #define _LIBCPP___ALGORITHM_RANGES_REPLACE_IF_H
11 
12 #include <__config>
13 #include <__functional/identity.h>
14 #include <__functional/invoke.h>
15 #include <__iterator/concepts.h>
16 #include <__iterator/projected.h>
17 #include <__ranges/access.h>
18 #include <__ranges/concepts.h>
19 #include <__ranges/dangling.h>
20 #include <__utility/move.h>
21 
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 #  pragma GCC system_header
24 #endif
25 
26 _LIBCPP_PUSH_MACROS
27 #include <__undef_macros>
28 
29 #if _LIBCPP_STD_VER >= 20
30 
31 _LIBCPP_BEGIN_NAMESPACE_STD
32 
33 namespace ranges {
34 
35 template <class _Iter, class _Sent, class _Type, class _Proj, class _Pred>
36 _LIBCPP_HIDE_FROM_ABI constexpr _Iter
37 __replace_if_impl(_Iter __first, _Sent __last, _Pred& __pred, const _Type& __new_value, _Proj& __proj) {
38   for (; __first != __last; ++__first) {
39     if (std::invoke(__pred, std::invoke(__proj, *__first)))
40       *__first = __new_value;
41   }
42   return __first;
43 }
44 
45 namespace __replace_if {
46 struct __fn {
47   template <input_iterator _Iter,
48             sentinel_for<_Iter> _Sent,
49             class _Type,
50             class _Proj = identity,
51             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
52     requires indirectly_writable<_Iter, const _Type&>
53   _LIBCPP_HIDE_FROM_ABI constexpr _Iter
54   operator()(_Iter __first, _Sent __last, _Pred __pred, const _Type& __new_value, _Proj __proj = {}) const {
55     return ranges::__replace_if_impl(std::move(__first), std::move(__last), __pred, __new_value, __proj);
56   }
57 
58   template <input_range _Range,
59             class _Type,
60             class _Proj = identity,
61             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
62     requires indirectly_writable<iterator_t<_Range>, const _Type&>
63   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
64   operator()(_Range&& __range, _Pred __pred, const _Type& __new_value, _Proj __proj = {}) const {
65     return ranges::__replace_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __new_value, __proj);
66   }
67 };
68 } // namespace __replace_if
69 
70 inline namespace __cpo {
71 inline constexpr auto replace_if = __replace_if::__fn{};
72 } // namespace __cpo
73 } // namespace ranges
74 
75 _LIBCPP_END_NAMESPACE_STD
76 
77 #endif // _LIBCPP_STD_VER >= 20
78 
79 _LIBCPP_POP_MACROS
80 
81 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_IF_H
82