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_FILL_H
10 #define _LIBCPP___ALGORITHM_RANGES_FILL_H
11 
12 #include <__algorithm/ranges_fill_n.h>
13 #include <__config>
14 #include <__iterator/concepts.h>
15 #include <__ranges/access.h>
16 #include <__ranges/concepts.h>
17 #include <__ranges/dangling.h>
18 
19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20 #  pragma GCC system_header
21 #endif
22 
23 _LIBCPP_PUSH_MACROS
24 #include <__undef_macros>
25 
26 #if _LIBCPP_STD_VER >= 20
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 namespace ranges {
31 namespace __fill {
32 struct __fn {
33   template <class _Type, output_iterator<const _Type&> _Iter, sentinel_for<_Iter> _Sent>
34   _LIBCPP_HIDE_FROM_ABI constexpr _Iter operator()(_Iter __first, _Sent __last, const _Type& __value) const {
35     if constexpr (random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>) {
36       return ranges::fill_n(__first, __last - __first, __value);
37     } else {
38       for (; __first != __last; ++__first)
39         *__first = __value;
40       return __first;
41     }
42   }
43 
44   template <class _Type, output_range<const _Type&> _Range>
45   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> operator()(_Range&& __range, const _Type& __value) const {
46     return (*this)(ranges::begin(__range), ranges::end(__range), __value);
47   }
48 };
49 } // namespace __fill
50 
51 inline namespace __cpo {
52 inline constexpr auto fill = __fill::__fn{};
53 } // namespace __cpo
54 } // namespace ranges
55 
56 _LIBCPP_END_NAMESPACE_STD
57 
58 #endif // _LIBCPP_STD_VER >= 20
59 
60 _LIBCPP_POP_MACROS
61 
62 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_H
63