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_GENERATE_N_H
10#define _LIBCPP___ALGORITHM_GENERATE_N_H
11
12#include <__algorithm/for_each_n.h>
13#include <__config>
14#include <__functional/identity.h>
15#include <__utility/forward.h>
16#include <__utility/move.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19# pragma GCC system_header
20#endif
21
22_LIBCPP_PUSH_MACROS
23#include <__undef_macros>
24
25_LIBCPP_BEGIN_NAMESPACE_STD
26
27template <class _OutputIterator, class _Size, class _Generator>
28inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
29__generate_n(_OutputIterator __first, _Size __orig_n, _Generator& __gen) {
30 using __iter_ref = decltype(*__first);
31 __identity __proj;
32 auto __f = [&](__iter_ref __element) { std::forward<__iter_ref>(__element) = __gen(); };
33 return std::__for_each_n(std::move(__first), __orig_n, __f, __proj);
34}
35
36template <class _OutputIterator, class _Size, class _Generator>
37inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
38generate_n(_OutputIterator __first, _Size __orig_n, _Generator __gen) {
39 return std::__generate_n(std::move(__first), __orig_n, __gen);
40}
41
42_LIBCPP_END_NAMESPACE_STD
43
44_LIBCPP_POP_MACROS
45
46#endif // _LIBCPP___ALGORITHM_GENERATE_N_H
47