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 <type_traits>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #pragma GCC system_header
18 #endif
19 
20 _LIBCPP_PUSH_MACROS
21 #include <__undef_macros>
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 #if _LIBCPP_STD_VER > 14
26 
27 template <class _InputIterator, class _Size, class _Function>
for_each_n(_InputIterator __first,_Size __orig_n,_Function __f)28 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _InputIterator for_each_n(_InputIterator __first,
29                                                                                          _Size __orig_n,
30                                                                                          _Function __f) {
31   typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize;
32   _IntegralSize __n = __orig_n;
33   while (__n > 0) {
34     __f(*__first);
35     ++__first;
36     --__n;
37   }
38   return __first;
39 }
40 
41 #endif
42 
43 _LIBCPP_END_NAMESPACE_STD
44 
45 _LIBCPP_POP_MACROS
46 
47 #endif // _LIBCPP___ALGORITHM_FOR_EACH_N_H
48