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 #if _LIBCPP_STD_VER >= 20
24 
25 _LIBCPP_BEGIN_NAMESPACE_STD
26 
27 namespace ranges {
28 namespace __fill {
29 struct __fn {
30   template <class _Type, output_iterator<const _Type&> _Iter, sentinel_for<_Iter> _Sent>
31   _LIBCPP_HIDE_FROM_ABI constexpr _Iter operator()(_Iter __first, _Sent __last, const _Type& __value) const {
32     if constexpr (random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>) {
33       return ranges::fill_n(__first, __last - __first, __value);
34     } else {
35       for (; __first != __last; ++__first)
36         *__first = __value;
37       return __first;
38     }
39   }
40 
41   template <class _Type, output_range<const _Type&> _Range>
42   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> operator()(_Range&& __range, const _Type& __value) const {
43     return (*this)(ranges::begin(__range), ranges::end(__range), __value);
44   }
45 };
46 } // namespace __fill
47 
48 inline namespace __cpo {
49 inline constexpr auto fill = __fill::__fn{};
50 } // namespace __cpo
51 } // namespace ranges
52 
53 _LIBCPP_END_NAMESPACE_STD
54 
55 #endif // _LIBCPP_STD_VER >= 20
56 
57 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_H
58