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368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
61 lines
2.2 KiB
C++
61 lines
2.2 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_INCLUSIVE_SCAN_H
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#define _LIBCPP___NUMERIC_INCLUSIVE_SCAN_H
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#include <__config>
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#include <__functional/operations.h>
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#include <__iterator/iterator_traits.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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inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b, _Tp __init) {
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for (; __first != __last; ++__first, (void)++__result) {
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__init = __b(__init, *__first);
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*__result = __init;
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}
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return __result;
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}
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template <class _InputIterator, class _OutputIterator, class _BinaryOp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
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inclusive_scan(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOp __b) {
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if (__first != __last) {
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typename iterator_traits<_InputIterator>::value_type __init = *__first;
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*__result++ = __init;
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if (++__first != __last)
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return _VSTD::inclusive_scan(__first, __last, __result, __b, __init);
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}
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return __result;
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}
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template <class _InputIterator, class _OutputIterator>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator inclusive_scan(_InputIterator __first,
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_InputIterator __last,
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_OutputIterator __result) {
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return _VSTD::inclusive_scan(__first, __last, __result, _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_INCLUSIVE_SCAN_H
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