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 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 template <class _BinaryPredicate, class _InputIterator, class _OutputIterator> 23 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 24 __unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred, 25 input_iterator_tag, output_iterator_tag) 26 { 27 if (__first != __last) 28 { 29 typename iterator_traits<_InputIterator>::value_type __t(*__first); 30 *__result = __t; 31 ++__result; 32 while (++__first != __last) 33 { 34 if (!__pred(__t, *__first)) 35 { 36 __t = *__first; 37 *__result = __t; 38 ++__result; 39 } 40 } 41 } 42 return __result; 43 } 44 45 template <class _BinaryPredicate, class _ForwardIterator, class _OutputIterator> 46 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 47 __unique_copy(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __result, _BinaryPredicate __pred, 48 forward_iterator_tag, output_iterator_tag) 49 { 50 if (__first != __last) 51 { 52 _ForwardIterator __i = __first; 53 *__result = *__i; 54 ++__result; 55 while (++__first != __last) 56 { 57 if (!__pred(*__i, *__first)) 58 { 59 *__result = *__first; 60 ++__result; 61 __i = __first; 62 } 63 } 64 } 65 return __result; 66 } 67 68 template <class _BinaryPredicate, class _InputIterator, class _ForwardIterator> 69 _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator 70 __unique_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __result, _BinaryPredicate __pred, 71 input_iterator_tag, forward_iterator_tag) 72 { 73 if (__first != __last) 74 { 75 *__result = *__first; 76 while (++__first != __last) 77 if (!__pred(*__result, *__first)) 78 *++__result = *__first; 79 ++__result; 80 } 81 return __result; 82 } 83 84 template <class _InputIterator, class _OutputIterator, class _BinaryPredicate> 85 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 86 _OutputIterator 87 unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred) 88 { 89 return _VSTD::__unique_copy<_BinaryPredicate&>(__first, __last, __result, __pred, 90 typename iterator_traits<_InputIterator>::iterator_category(), 91 typename iterator_traits<_OutputIterator>::iterator_category()); 92 } 93 94 template <class _InputIterator, class _OutputIterator> 95 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 96 _OutputIterator 97 unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 98 { 99 typedef typename iterator_traits<_InputIterator>::value_type __v; 100 return _VSTD::unique_copy(__first, __last, __result, __equal_to<__v>()); 101 } 102 103 104 _LIBCPP_END_NAMESPACE_STD 105 106 #endif // _LIBCPP___ALGORITHM_UNIQUE_COPY_H 107