derek.holloway
7502bf64a4
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69 lines
2.2 KiB
C++
69 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_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_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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
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adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
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if (__first != __last) {
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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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typename iterator_traits<_InputIterator>::value_type __val(*__first);
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#if _LIBCPP_STD_VER >= 20
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*__result = __val - std::move(__acc);
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#else
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*__result = __val - __acc;
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#endif
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__acc = std::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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator adjacent_difference(
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_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOperation __binary_op) {
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if (__first != __last) {
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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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typename iterator_traits<_InputIterator>::value_type __val(*__first);
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#if _LIBCPP_STD_VER >= 20
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*__result = __binary_op(__val, std::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 = std::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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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H
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