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___NUMERIC_PARTIAL_SUM_H 11#define _LIBCPP___NUMERIC_PARTIAL_SUM_H 12 13#include <__config> 14#include <__iterator/iterator_traits.h> 15#include <__utility/move.h> 16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18# pragma GCC system_header 19#endif 20 21_LIBCPP_BEGIN_NAMESPACE_STD 22 23template <class _InputIterator, class _OutputIterator> 24_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 25_OutputIterator 26partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 27{ 28 if (__first != __last) 29 { 30 typename iterator_traits<_InputIterator>::value_type __t(*__first); 31 *__result = __t; 32 for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result) 33 { 34#if _LIBCPP_STD_VER > 17 35 __t = _VSTD::move(__t) + *__first; 36#else 37 __t = __t + *__first; 38#endif 39 *__result = __t; 40 } 41 } 42 return __result; 43} 44 45template <class _InputIterator, class _OutputIterator, class _BinaryOperation> 46_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 47_OutputIterator 48partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result, 49 _BinaryOperation __binary_op) 50{ 51 if (__first != __last) 52 { 53 typename iterator_traits<_InputIterator>::value_type __t(*__first); 54 *__result = __t; 55 for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result) 56 { 57#if _LIBCPP_STD_VER > 17 58 __t = __binary_op(_VSTD::move(__t), *__first); 59#else 60 __t = __binary_op(__t, *__first); 61#endif 62 *__result = __t; 63 } 64 } 65 return __result; 66} 67 68_LIBCPP_END_NAMESPACE_STD 69 70#endif // _LIBCPP___NUMERIC_PARTIAL_SUM_H 71