forked from OSchip/llvm-project
73 lines
2.3 KiB
C++
73 lines
2.3 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_ADJACENT_DIFFERENCE_H
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#define _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_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_BEGIN_NAMESPACE_STD
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template <class _InputIterator, class _OutputIterator>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_OutputIterator
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adjacent_difference(_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 __acc(*__first);
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*__result = __acc;
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for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
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{
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typename iterator_traits<_InputIterator>::value_type __val(*__first);
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#if _LIBCPP_STD_VER > 17
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*__result = __val - _VSTD::move(__acc);
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#else
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*__result = __val - __acc;
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#endif
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__acc = _VSTD::move(__val);
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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_AFTER_CXX17
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_OutputIterator
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adjacent_difference(_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 __acc(*__first);
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*__result = __acc;
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for (++__first, (void) ++__result; __first != __last; ++__first, (void) ++__result)
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{
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typename iterator_traits<_InputIterator>::value_type __val(*__first);
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#if _LIBCPP_STD_VER > 17
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*__result = __binary_op(__val, _VSTD::move(__acc));
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#else
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*__result = __binary_op(__val, __acc);
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#endif
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__acc = _VSTD::move(__val);
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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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#endif // _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H
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