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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-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___NUMERIC_ADJACENT_DIFFERENCE_H |
| 11 | #define _LIBCPP___CXX03___NUMERIC_ADJACENT_DIFFERENCE_H |
| 12 | |
| 13 | #include <__cxx03/__config> |
| 14 | #include <__cxx03/__iterator/iterator_traits.h> |
| 15 | #include <__cxx03/__utility/move.h> |
| 16 | |
| 17 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 18 | # pragma GCC system_header |
| 19 | #endif |
| 20 | |
| 21 | _LIBCPP_PUSH_MACROS |
| 22 | #include <__cxx03/__undef_macros> |
| 23 | |
| 24 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 25 | |
| 26 | template <class _InputIterator, class _OutputIterator> |
| 27 | _LIBCPP_HIDE_FROM_ABI _OutputIterator |
| 28 | adjacent_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 | *__result = __val - __acc; |
| 35 | __acc = std::move(__val); |
| 36 | } |
| 37 | } |
| 38 | return __result; |
| 39 | } |
| 40 | |
| 41 | template <class _InputIterator, class _OutputIterator, class _BinaryOperation> |
| 42 | _LIBCPP_HIDE_FROM_ABI _OutputIterator adjacent_difference( |
| 43 | _InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryOperation __binary_op) { |
| 44 | if (__first != __last) { |
| 45 | typename iterator_traits<_InputIterator>::value_type __acc(*__first); |
| 46 | *__result = __acc; |
| 47 | for (++__first, (void)++__result; __first != __last; ++__first, (void)++__result) { |
| 48 | typename iterator_traits<_InputIterator>::value_type __val(*__first); |
| 49 | *__result = __binary_op(__val, __acc); |
| 50 | __acc = std::move(__val); |
| 51 | } |
| 52 | } |
| 53 | return __result; |
| 54 | } |
| 55 | |
| 56 | _LIBCPP_END_NAMESPACE_STD |
| 57 | |
| 58 | _LIBCPP_POP_MACROS |
| 59 | |
| 60 | #endif // _LIBCPP___CXX03___NUMERIC_ADJACENT_DIFFERENCE_H |
| 61 |
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