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___NUMERIC_ADJACENT_DIFFERENCE_H 11 #define _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H 12 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_header 19 #endif 20 21 _LIBCPP_PUSH_MACROS 22 #include <__undef_macros> 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 template <class _InputIterator, class _OutputIterator> 27 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _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 #if _LIBCPP_STD_VER >= 20 35 *__result = __val - std::move(__acc); 36 #else 37 *__result = __val - __acc; 38 #endif 39 __acc = std::move(__val); 40 } 41 } 42 return __result; 43 } 44 45 template <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 >= 20 54 *__result = __binary_op(__val, std::move(__acc)); 55 #else 56 *__result = __binary_op(__val, __acc); 57 #endif 58 __acc = std::move(__val); 59 } 60 } 61 return __result; 62 } 63 64 _LIBCPP_END_NAMESPACE_STD 65 66 _LIBCPP_POP_MACROS 67 68 #endif // _LIBCPP___NUMERIC_ADJACENT_DIFFERENCE_H 69