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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
#define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
#include <__config>
#include <__functional/operations.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 17
template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) {
if (__first != __last) {
_Tp __tmp(__b(__init, *__first));
while (true) {
*__result = std::move(__init);
++__result;
++__first;
if (__first == __last)
break;
__init = std::move(__tmp);
__tmp = __b(__init, *__first);
}
}
return __result;
}
template <class _InputIterator, class _OutputIterator, class _Tp>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) {
return std::exclusive_scan(__first, __last, __result, __init, std::plus<>());
}
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
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