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| 1 | +// -*- C++ -*- |
| 2 | +//===----------------------------------------------------------------------===// |
| 3 | +// |
| 4 | +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | +// See https://llvm.org/LICENSE.txt for license information. |
| 6 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | +// |
| 8 | +//===----------------------------------------------------------------------===// |
| 9 | + |
| 10 | +#ifndef _LIBCPP___NUMERIC_RANGES_IOTA_H |
| 11 | +#define _LIBCPP___NUMERIC_RANGES_IOTA_H |
| 12 | + |
| 13 | +#include <__algorithm/out_value_result.h> |
| 14 | +#include <__config> |
| 15 | +#include <__iterator/concepts.h> |
| 16 | +#include <__ranges/access.h> |
| 17 | +#include <__ranges/concepts.h> |
| 18 | +#include <__ranges/dangling.h> |
| 19 | +#include <__utility/as_const.h> |
| 20 | +#include <__utility/move.h> |
| 21 | + |
| 22 | +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 23 | +# pragma GCC system_header |
| 24 | +#endif |
| 25 | + |
| 26 | +_LIBCPP_PUSH_MACROS |
| 27 | +#include <__undef_macros> |
| 28 | + |
| 29 | +_LIBCPP_BEGIN_NAMESPACE_STD |
| 30 | + |
| 31 | +#if _LIBCPP_STD_VER >= 23 |
| 32 | +namespace ranges { |
| 33 | +template <typename _Out, typename _Tp> |
| 34 | +using iota_result = ranges::out_value_result<_Out, _Tp>; |
| 35 | + |
| 36 | +struct __iota_fn { |
| 37 | +public: |
| 38 | + template <input_or_output_iterator _Out, sentinel_for<_Out> _Sent, weakly_incrementable _Tp> |
| 39 | + requires indirectly_writable<_Out, const _Tp&> |
| 40 | + _LIBCPP_HIDE_FROM_ABI static constexpr iota_result<_Out, _Tp> operator()(_Out __first, _Sent __last, _Tp __value) { |
| 41 | + while (__first != __last) { |
| 42 | + *__first = std::as_const(__value); |
| 43 | + ++__first; |
| 44 | + ++__value; |
| 45 | + } |
| 46 | + return {std::move(__first), std::move(__value)}; |
| 47 | + } |
| 48 | + |
| 49 | + template <weakly_incrementable _Tp, ranges::output_range<const _Tp&> _Range> |
| 50 | + _LIBCPP_HIDE_FROM_ABI static constexpr iota_result<ranges::borrowed_iterator_t<_Range>, _Tp> |
| 51 | + operator()(_Range&& __r, _Tp __value) { |
| 52 | + return operator()(ranges::begin(__r), ranges::end(__r), std::move(__value)); |
| 53 | + } |
| 54 | +}; |
| 55 | + |
| 56 | +inline constexpr auto iota = __iota_fn{}; |
| 57 | +} // namespace ranges |
| 58 | + |
| 59 | +#endif // _LIBCPP_STD_VER >= 23 |
| 60 | + |
| 61 | +_LIBCPP_END_NAMESPACE_STD |
| 62 | + |
| 63 | +_LIBCPP_POP_MACROS |
| 64 | + |
| 65 | +#endif // _LIBCPP___NUMERIC_RANGES_IOTA_H |
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