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// -*- 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___NUMERIC_RANGES_IOTA_H
#define _LIBCPP___NUMERIC_RANGES_IOTA_H
#include <__algorithm/out_value_result.h>
#include <__config>
#include <__iterator/concepts.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/dangling.h>
#include <__utility/as_const.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 23
namespace ranges {
template <typename _Out, typename _Tp>
using iota_result = ranges::out_value_result<_Out, _Tp>;
struct __iota_fn {
public:
template <input_or_output_iterator _Out, sentinel_for<_Out> _Sent, weakly_incrementable _Tp>
requires indirectly_writable<_Out, const _Tp&>
_LIBCPP_HIDE_FROM_ABI static constexpr iota_result<_Out, _Tp> operator()(_Out __first, _Sent __last, _Tp __value) {
while (__first != __last) {
*__first = std::as_const(__value);
++__first;
++__value;
}
return {std::move(__first), std::move(__value)};
}
template <weakly_incrementable _Tp, ranges::output_range<const _Tp&> _Range>
_LIBCPP_HIDE_FROM_ABI static constexpr iota_result<ranges::borrowed_iterator_t<_Range>, _Tp>
operator()(_Range&& __r, _Tp __value) {
return operator()(ranges::begin(__r), ranges::end(__r), std::move(__value));
}
};
inline constexpr auto iota = __iota_fn{};
} // namespace ranges
#endif // _LIBCPP_STD_VER >= 23
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___NUMERIC_RANGES_IOTA_H
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