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_EXCLUSIVE_SCAN_H 11#define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 12 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_header 19#endif 20 21_LIBCPP_PUSH_MACROS 22#include <__undef_macros> 23 24_LIBCPP_BEGIN_NAMESPACE_STD 25 26#if _LIBCPP_STD_VER >= 17 27 28template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp> 29_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 30exclusive_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 _OutputIterator 48exclusive_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 >= 17 53 54_LIBCPP_END_NAMESPACE_STD 55 56_LIBCPP_POP_MACROS 57 58#endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H 59