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