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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H11#define _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H12 13#include <__config>14#include <__iterator/iterator_traits.h>15#include <__utility/move.h>16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)18# pragma GCC system_header19#endif20 21_LIBCPP_PUSH_MACROS22#include <__undef_macros>23 24_LIBCPP_BEGIN_NAMESPACE_STD25 26template <class _InputIterator, class _OutputIterator>27_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator28adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {29 if (__first != __last) {30 typename iterator_traits<_InputIterator>::value_type __acc(*__first);31 *__result = __acc;32 for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) {33 typename iterator_traits<_InputIterator>::value_type __val(*__first);34#if _LIBCPP_STD_VER >= 2035 *__result = __val - std::move(__acc);36#else37 *__result = __val - __acc;38#endif39 __acc = std::move(__val);40 }41 }42 return __result;43}44 45template <class _InputIterator, class _OutputIterator, class _BinaryOperation>46_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator adjacent_difference(47 _InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOperation __binary_op) {48 if (__first != __last) {49 typename iterator_traits<_InputIterator>::value_type __acc(*__first);50 *__result = __acc;51 for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) {52 typename iterator_traits<_InputIterator>::value_type __val(*__first);53#if _LIBCPP_STD_VER >= 2054 *__result = __binary_op(__val, std::move(__acc));55#else56 *__result = __binary_op(__val, __acc);57#endif58 __acc = std::move(__val);59 }60 }61 return __result;62}63 64_LIBCPP_END_NAMESPACE_STD65 66_LIBCPP_POP_MACROS67 68#endif // _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H69