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_FOR_EACH_H
10#define _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
11
12#include <__algorithm/in_fun_result.h>
13#include <__config>
14#include <__functional/identity.h>
15#include <__functional/invoke.h>
16#include <__iterator/concepts.h>
17#include <__iterator/projected.h>
18#include <__ranges/access.h>
19#include <__ranges/concepts.h>
20#include <__ranges/dangling.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 {
35
36template <class _Iter, class _Func>
37using for_each_result = in_fun_result<_Iter, _Func>;
38
39namespace __for_each {
40struct __fn {
41private:
42  template <class _Iter, class _Sent, class _Proj, class _Func>
43  _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func>
44  __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) {
45    for (; __first != __last; ++__first)
46      std::invoke(__func, std::invoke(__proj, *__first));
47    return {std::move(__first), std::move(__func)};
48  }
49
50public:
51  template <input_iterator _Iter,
52            sentinel_for<_Iter> _Sent,
53            class _Proj = identity,
54            indirectly_unary_invocable<projected<_Iter, _Proj>> _Func>
55  _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<_Iter, _Func>
56  operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const {
57    return __for_each_impl(std::move(__first), std::move(__last), __func, __proj);
58  }
59
60  template <input_range _Range,
61            class _Proj = identity,
62            indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func>
63  _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<borrowed_iterator_t<_Range>, _Func>
64  operator()(_Range&& __range, _Func __func, _Proj __proj = {}) const {
65    return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj);
66  }
67};
68} // namespace __for_each
69
70inline namespace __cpo {
71inline constexpr auto for_each = __for_each::__fn{};
72} // namespace __cpo
73} // namespace ranges
74
75_LIBCPP_END_NAMESPACE_STD
76
77#endif // _LIBCPP_STD_VER >= 20
78
79_LIBCPP_POP_MACROS
80
81#endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
82