xref: /freebsd/contrib/llvm-project/libcxx/include/__algorithm/ranges_fill_n.h (revision b3edf4467982447620505a28fc82e38a414c07dc)
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_N_H
10 #define _LIBCPP___ALGORITHM_RANGES_FILL_N_H
11 
12 #include <__config>
13 #include <__iterator/concepts.h>
14 #include <__iterator/incrementable_traits.h>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #  pragma GCC system_header
18 #endif
19 
20 _LIBCPP_PUSH_MACROS
21 #include <__undef_macros>
22 
23 #if _LIBCPP_STD_VER >= 20
24 
25 _LIBCPP_BEGIN_NAMESPACE_STD
26 
27 namespace ranges {
28 namespace __fill_n {
29 struct __fn {
30   template <class _Type, output_iterator<const _Type&> _Iter>
31   _LIBCPP_HIDE_FROM_ABI constexpr _Iter
32   operator()(_Iter __first, iter_difference_t<_Iter> __n, const _Type& __value) const {
33     for (; __n != 0; --__n) {
34       *__first = __value;
35       ++__first;
36     }
37     return __first;
38   }
39 };
40 } // namespace __fill_n
41 
42 inline namespace __cpo {
43 inline constexpr auto fill_n = __fill_n::__fn{};
44 } // namespace __cpo
45 } // namespace ranges
46 
47 _LIBCPP_END_NAMESPACE_STD
48 
49 #endif // _LIBCPP_STD_VER >= 20
50 
51 _LIBCPP_POP_MACROS
52 
53 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_N_H
54