1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___ALGORITHM_UNIQUE_COPY_H 10 #define _LIBCPP___ALGORITHM_UNIQUE_COPY_H 11 12 #include <__algorithm/comp.h> 13 #include <__config> 14 #include <__iterator/iterator_traits.h> 15 #include <utility> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 #pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 template <class _BinaryPredicate, class _InputIterator, class _OutputIterator> 24 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 25 __unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred, 26 input_iterator_tag, output_iterator_tag) 27 { 28 if (__first != __last) 29 { 30 typename iterator_traits<_InputIterator>::value_type __t(*__first); 31 *__result = __t; 32 ++__result; 33 while (++__first != __last) 34 { 35 if (!__pred(__t, *__first)) 36 { 37 __t = *__first; 38 *__result = __t; 39 ++__result; 40 } 41 } 42 } 43 return __result; 44 } 45 46 template <class _BinaryPredicate, class _ForwardIterator, class _OutputIterator> 47 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 48 __unique_copy(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __result, _BinaryPredicate __pred, 49 forward_iterator_tag, output_iterator_tag) 50 { 51 if (__first != __last) 52 { 53 _ForwardIterator __i = __first; 54 *__result = *__i; 55 ++__result; 56 while (++__first != __last) 57 { 58 if (!__pred(*__i, *__first)) 59 { 60 *__result = *__first; 61 ++__result; 62 __i = __first; 63 } 64 } 65 } 66 return __result; 67 } 68 69 template <class _BinaryPredicate, class _InputIterator, class _ForwardIterator> 70 _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator 71 __unique_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __result, _BinaryPredicate __pred, 72 input_iterator_tag, forward_iterator_tag) 73 { 74 if (__first != __last) 75 { 76 *__result = *__first; 77 while (++__first != __last) 78 if (!__pred(*__result, *__first)) 79 *++__result = *__first; 80 ++__result; 81 } 82 return __result; 83 } 84 85 template <class _InputIterator, class _OutputIterator, class _BinaryPredicate> 86 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 87 _OutputIterator 88 unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred) 89 { 90 return _VSTD::__unique_copy<_BinaryPredicate&>(__first, __last, __result, __pred, 91 typename iterator_traits<_InputIterator>::iterator_category(), 92 typename iterator_traits<_OutputIterator>::iterator_category()); 93 } 94 95 template <class _InputIterator, class _OutputIterator> 96 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 97 _OutputIterator 98 unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 99 { 100 typedef typename iterator_traits<_InputIterator>::value_type __v; 101 return _VSTD::unique_copy(__first, __last, __result, __equal_to<__v>()); 102 } 103 104 105 _LIBCPP_END_NAMESPACE_STD 106 107 #endif // _LIBCPP___ALGORITHM_UNIQUE_COPY_H 108