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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_EXCLUSIVE_SCAN_H11#define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H12 13#include <__config>14#include <__functional/operations.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 26#if _LIBCPP_STD_VER >= 1727 28template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>29_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator30exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) {31 if (__first != __last) {32 _Tp __tmp(__b(__init, *__first));33 while (true) {34 *__result = std::move(__init);35 ++__result;36 ++__first;37 if (__first == __last)38 break;39 __init = std::move(__tmp);40 __tmp = __b(__init, *__first);41 }42 }43 return __result;44}45 46template <class _InputIterator, class _OutputIterator, class _Tp>47_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator48exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) {49 return std::exclusive_scan(__first, __last, __result, __init, std::plus<>());50}51 52#endif // _LIBCPP_STD_VER >= 1753 54_LIBCPP_END_NAMESPACE_STD55 56_LIBCPP_POP_MACROS57 58#endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H59