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_GENERATE_H
10#define _LIBCPP___ALGORITHM_RANGES_GENERATE_H
11
12#include <__concepts/constructible.h>
13#include <__concepts/invocable.h>
14#include <__config>
15#include <__iterator/concepts.h>
16#include <__iterator/iterator_traits.h>
17#include <__ranges/access.h>
18#include <__ranges/concepts.h>
19#include <__ranges/dangling.h>
20#include <__type_traits/invoke.h>
21#include <__utility/move.h>
22
23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24# pragma GCC system_header
25#endif
26
27_LIBCPP_PUSH_MACROS
28#include <__undef_macros>
29
30#if _LIBCPP_STD_VER >= 20
31
32_LIBCPP_BEGIN_NAMESPACE_STD
33
34namespace ranges {
35struct __generate {
36 template <class _OutIter, class _Sent, class _Func>
37 _LIBCPP_HIDE_FROM_ABI constexpr static _OutIter __generate_fn_impl(_OutIter __first, _Sent __last, _Func& __gen) {
38 for (; __first != __last; ++__first) {
39 *__first = __gen();
40 }
41
42 return __first;
43 }
44
45 template <input_or_output_iterator _OutIter, sentinel_for<_OutIter> _Sent, copy_constructible _Func>
46 requires invocable<_Func&> && indirectly_writable<_OutIter, invoke_result_t<_Func&>>
47 _LIBCPP_HIDE_FROM_ABI constexpr _OutIter operator()(_OutIter __first, _Sent __last, _Func __gen) const {
48 return __generate_fn_impl(std::move(__first), std::move(__last), __gen);
49 }
50
51 template <class _Range, copy_constructible _Func>
52 requires invocable<_Func&> && output_range<_Range, invoke_result_t<_Func&>>
53 _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> operator()(_Range&& __range, _Func __gen) const {
54 return __generate_fn_impl(ranges::begin(__range), ranges::end(__range), __gen);
55 }
56};
57
58inline namespace __cpo {
59inline constexpr auto generate = __generate{};
60} // namespace __cpo
61} // namespace ranges
62
63_LIBCPP_END_NAMESPACE_STD
64
65#endif // _LIBCPP_STD_VER >= 20
66
67_LIBCPP_POP_MACROS
68
69#endif // _LIBCPP___ALGORITHM_RANGES_GENERATE_H
70