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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___CXX03___NUMERIC_ADJACENT_DIFFERENCE_H
#define _LIBCPP___CXX03___NUMERIC_ADJACENT_DIFFERENCE_H
#include <__cxx03/__config>
#include <__cxx03/__iterator/iterator_traits.h>
#include <__cxx03/__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__cxx03/__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _InputIterator, class _OutputIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
if (__first != __last) {
typename iterator_traits<_InputIterator>::value_type __acc(*__first);
*__result = __acc;
for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) {
typename iterator_traits<_InputIterator>::value_type __val(*__first);
#if _LIBCPP_STD_VER >= 20
*__result = __val - std::move(__acc);
#else
*__result = __val - __acc;
#endif
__acc = std::move(__val);
}
}
return __result;
}
template <class _InputIterator, class _OutputIterator, class _BinaryOperation>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator adjacent_difference(
_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOperation __binary_op) {
if (__first != __last) {
typename iterator_traits<_InputIterator>::value_type __acc(*__first);
*__result = __acc;
for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) {
typename iterator_traits<_InputIterator>::value_type __val(*__first);
#if _LIBCPP_STD_VER >= 20
*__result = __binary_op(__val, std::move(__acc));
#else
*__result = __binary_op(__val, __acc);
#endif
__acc = std::move(__val);
}
}
return __result;
}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___CXX03___NUMERIC_ADJACENT_DIFFERENCE_H
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