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 #if _LIBCPP_STD_VER > 17 && !defined (_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 namespace ranges {
31 
32 template <class _Iter, class _Sent, class _Type, class _Proj, class _Pred>
33 _LIBCPP_HIDE_FROM_ABI constexpr
34 _Iter __replace_if_impl(_Iter __first, _Sent __last, _Pred& __pred, const _Type& __new_value, _Proj& __proj) {
35   for (; __first != __last; ++__first) {
36     if (std::invoke(__pred, std::invoke(__proj, *__first)))
37       *__first = __new_value;
38   }
39   return __first;
40 }
41 
42 namespace __replace_if {
43 struct __fn {
44 
45   template <input_iterator _Iter, sentinel_for<_Iter> _Sent,
46             class _Type,
47             class _Proj = identity,
48             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
49     requires indirectly_writable<_Iter, const _Type&>
50   _LIBCPP_HIDE_FROM_ABI constexpr
51   _Iter operator()(_Iter __first, _Sent __last, _Pred __pred, const _Type& __new_value, _Proj __proj = {}) const {
52     return ranges::__replace_if_impl(std::move(__first), std::move(__last), __pred, __new_value, __proj);
53   }
54 
55   template <input_range _Range,
56             class _Type,
57             class _Proj = identity,
58             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
59     requires indirectly_writable<iterator_t<_Range>, const _Type&>
60   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
61   operator()(_Range&& __range, _Pred __pred, const _Type& __new_value, _Proj __proj = {}) const {
62     return ranges::__replace_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __new_value, __proj);
63   }
64 
65 };
66 } // namespace __replace_if
67 
68 inline namespace __cpo {
69   inline constexpr auto replace_if = __replace_if::__fn{};
70 } // namespace __cpo
71 } // namespace ranges
72 
73 _LIBCPP_END_NAMESPACE_STD
74 
75 #endif // _LIBCPP_STD_VER > 17 && !defined (_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
76 
77 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_IF_H
78