Nikolas Klauser 7af89a379c [libc++] Implement ranges::fill{, _n}
Reviewed By: var-const, #libc

Spies: libcxx-commits, mgorny

Differential Revision: https://reviews.llvm.org/D123462
2022-05-25 10:27:13 +02:00

49 lines
1.4 KiB
C++

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_RANGES_FILL_N_H
#define _LIBCPP___ALGORITHM_RANGES_FILL_N_H
#include <__config>
#include <__iterator/concepts.h>
#include <__iterator/incrementable_traits.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
namespace __fill_n {
struct __fn {
template <class _Type, output_iterator<const _Type&> _Iter>
_LIBCPP_HIDE_FROM_ABI constexpr
_Iter operator()(_Iter __first, iter_difference_t<_Iter> __n, const _Type& __value) const {
for (; __n != 0; --__n) {
*__first = __value;
++__first;
}
return __first;
}
};
} // namespace __fill_n
inline namespace __cpo {
inline constexpr auto fill_n = __fill_n::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
#endif // _LIBCPP___ALGORITHM_RANGES_FILL_N_H