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 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 #if _LIBCPP_STD_VER >= 17 23 24 template <class _InputIterator, class _Size, class _Function> 25 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator 26 for_each_n(_InputIterator __first, _Size __orig_n, _Function __f) { 27 typedef decltype(std::__convert_to_integral(__orig_n)) _IntegralSize; 28 _IntegralSize __n = __orig_n; 29 while (__n > 0) { 30 __f(*__first); 31 ++__first; 32 --__n; 33 } 34 return __first; 35 } 36 37 #endif 38 39 _LIBCPP_END_NAMESPACE_STD 40 41 #endif // _LIBCPP___ALGORITHM_FOR_EACH_N_H 42