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_H 10 #define _LIBCPP___ALGORITHM_UNIQUE_H 11 12 #include <__algorithm/adjacent_find.h> 13 #include <__algorithm/comp.h> 14 #include <__algorithm/iterator_operations.h> 15 #include <__config> 16 #include <__iterator/iterator_traits.h> 17 #include <__utility/move.h> 18 #include <__utility/pair.h> 19 20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21 # pragma GCC system_header 22 #endif 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 // unique 27 28 template <class _AlgPolicy, class _Iter, class _Sent, class _BinaryPredicate> 29 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 std::pair<_Iter, _Iter> 30 __unique(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) { 31 __first = std::__adjacent_find(__first, __last, __pred); 32 if (__first != __last) { 33 // ... a a ? ... 34 // f i 35 _Iter __i = __first; 36 for (++__i; ++__i != __last;) 37 if (!__pred(*__first, *__i)) 38 *++__first = _IterOps<_AlgPolicy>::__iter_move(__i); 39 ++__first; 40 return std::pair<_Iter, _Iter>(std::move(__first), std::move(__i)); 41 } 42 return std::pair<_Iter, _Iter>(__first, __first); 43 } 44 45 template <class _ForwardIterator, class _BinaryPredicate> 46 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 47 unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) { 48 return std::__unique<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred).first; 49 } 50 51 template <class _ForwardIterator> 52 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 53 unique(_ForwardIterator __first, _ForwardIterator __last) { 54 return std::unique(__first, __last, __equal_to()); 55 } 56 57 _LIBCPP_END_NAMESPACE_STD 58 59 #endif // _LIBCPP___ALGORITHM_UNIQUE_H 60