67 lines · c
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-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___NUMERIC_PARTIAL_SUM_H11#define _LIBCPP___NUMERIC_PARTIAL_SUM_H12 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_header19#endif20 21_LIBCPP_PUSH_MACROS22#include <__undef_macros>23 24_LIBCPP_BEGIN_NAMESPACE_STD25 26template <class _InputIterator, class _OutputIterator>27_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator28partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {29 if (__first != __last) {30 typename iterator_traits<_InputIterator>::value_type __t(*__first);31 *__result = __t;32 for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) {33#if _LIBCPP_STD_VER >= 2034 __t = std::move(__t) + *__first;35#else36 __t = __t + *__first;37#endif38 *__result = __t;39 }40 }41 return __result;42}43 44template <class _InputIterator, class _OutputIterator, class _BinaryOperation>45_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator46partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOperation __binary_op) {47 if (__first != __last) {48 typename iterator_traits<_InputIterator>::value_type __t(*__first);49 *__result = __t;50 for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) {51#if _LIBCPP_STD_VER >= 2052 __t = __binary_op(std::move(__t), *__first);53#else54 __t = __binary_op(__t, *__first);55#endif56 *__result = __t;57 }58 }59 return __result;60}61 62_LIBCPP_END_NAMESPACE_STD63 64_LIBCPP_POP_MACROS65 66#endif // _LIBCPP___NUMERIC_PARTIAL_SUM_H67