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_PUSH_MACROS 25 #include <__undef_macros> 26 27 _LIBCPP_BEGIN_NAMESPACE_STD 28 29 // unique 30 31 template <class _AlgPolicy, class _Iter, class _Sent, class _BinaryPredicate> 32 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 std::pair<_Iter, _Iter> 33 __unique(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) { 34 __first = std::__adjacent_find(__first, __last, __pred); 35 if (__first != __last) { 36 // ... a a ? ... 37 // f i 38 _Iter __i = __first; 39 for (++__i; ++__i != __last;) 40 if (!__pred(*__first, *__i)) 41 *++__first = _IterOps<_AlgPolicy>::__iter_move(__i); 42 ++__first; 43 return std::pair<_Iter, _Iter>(std::move(__first), std::move(__i)); 44 } 45 return std::pair<_Iter, _Iter>(__first, __first); 46 } 47 48 template <class _ForwardIterator, class _BinaryPredicate> 49 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 50 unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) { 51 return std::__unique<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred).first; 52 } 53 54 template <class _ForwardIterator> 55 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 56 unique(_ForwardIterator __first, _ForwardIterator __last) { 57 return std::unique(__first, __last, __equal_to()); 58 } 59 60 _LIBCPP_END_NAMESPACE_STD 61 62 _LIBCPP_POP_MACROS 63 64 #endif // _LIBCPP___ALGORITHM_UNIQUE_H 65