54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
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#define _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
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#include <__config>
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#include <__functional/operations.h>
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#include <__utility/move.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 14
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template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
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exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init, _BinaryOp __b) {
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if (__first != __last) {
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_Tp __tmp(__b(__init, *__first));
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while (true) {
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*__result = _VSTD::move(__init);
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++__result;
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++__first;
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if (__first == __last)
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break;
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__init = _VSTD::move(__tmp);
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__tmp = __b(__init, *__first);
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}
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}
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return __result;
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}
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template <class _InputIterator, class _OutputIterator, class _Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
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exclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Tp __init) {
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return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>());
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}
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___NUMERIC_EXCLUSIVE_SCAN_H
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