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___ALGORITHM_FOR_EACH_N_H
11 #define _LIBCPP___ALGORITHM_FOR_EACH_N_H
12 
13 #include <__config>
14 #include <__utility/convert_to_integral.h>
15 #include <type_traits>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 #if _LIBCPP_STD_VER > 14
24 
25 template <class _InputIterator, class _Size, class _Function>
26 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator for_each_n(_InputIterator __first,
27                                                                                          _Size __orig_n,
28                                                                                          _Function __f) {
29   typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize;
30   _IntegralSize __n = __orig_n;
31   while (__n > 0) {
32     __f(*__first);
33     ++__first;
34     --__n;
35   }
36   return __first;
37 }
38 
39 #endif
40 
41 _LIBCPP_END_NAMESPACE_STD
42 
43 #endif // _LIBCPP___ALGORITHM_FOR_EACH_N_H
44