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5d4439cc3e
release/17.x branch, commit 8f4dd44097c9ae25dd203d5ac87f3b48f854bba8 This adds the flag `-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL`. A future enhancement could possibly pass something different if there is a compelling parallel implementation. That libdispatch one might be worth looking into.
75 lines
2.1 KiB
C++
Vendored
75 lines
2.1 KiB
C++
Vendored
// -*- 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_PARTIAL_SUM_H
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#define _LIBCPP___NUMERIC_PARTIAL_SUM_H
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#include <__config>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _InputIterator, class _OutputIterator>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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_OutputIterator
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partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result)
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{
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if (__first != __last)
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{
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typename iterator_traits<_InputIterator>::value_type __t(*__first);
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*__result = __t;
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for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
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{
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#if _LIBCPP_STD_VER >= 20
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__t = _VSTD::move(__t) + *__first;
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#else
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__t = __t + *__first;
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#endif
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*__result = __t;
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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 _BinaryOperation>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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_OutputIterator
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partial_sum(_InputIterator __first, _InputIterator __last, _OutputIterator __result,
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_BinaryOperation __binary_op)
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{
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if (__first != __last)
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{
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typename iterator_traits<_InputIterator>::value_type __t(*__first);
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*__result = __t;
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for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
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{
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#if _LIBCPP_STD_VER >= 20
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__t = __binary_op(_VSTD::move(__t), *__first);
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#else
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__t = __binary_op(__t, *__first);
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#endif
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*__result = __t;
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}
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}
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return __result;
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___NUMERIC_PARTIAL_SUM_H
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