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 23 template <class _InputIterator, class _OutputIterator> 24 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 25 _OutputIterator 26 partial_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 45 template <class _InputIterator, class _OutputIterator, class _BinaryOperation> 46 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 47 _OutputIterator 48 partial_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