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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___CXX03___NUMERIC_INCLUSIVE_SCAN_H
#define _LIBCPP___CXX03___NUMERIC_INCLUSIVE_SCAN_H
#include <__cxx03/__config>
#include <__cxx03/__functional/operations.h>
#include <__cxx03/__iterator/iterator_traits.h>
#include <__cxx03/__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_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
inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _Tp __init) {
for (; __first != __last; ++__first, (void)++__result) {
__init = __b(__init, *__first);
*__result = __init;
}
return __result;
}
template <class _InputIterator, class _OutputIterator, class _BinaryOp>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b) {
if (__first != __last) {
typename iterator_traits<_InputIterator>::value_type __init = *__first;
*__result++ = __init;
if (++__first != __last)
return std::inclusive_scan(__first, __last, __result, __b, __init);
}
return __result;
}
template <class _InputIterator, class _OutputIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
return std::inclusive_scan(__first, __last, __result, std::plus<>());
}
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___CXX03___NUMERIC_INCLUSIVE_SCAN_H
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