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 <__functional/identity.h> 17 #include <__iterator/iterator_traits.h> 18 #include <__utility/move.h> 19 #include <__utility/pair.h> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 #endif 24 25 _LIBCPP_PUSH_MACROS 26 #include <__undef_macros> 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 // unique 31 32 template <class _AlgPolicy, class _Iter, class _Sent, class _BinaryPredicate> 33 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 std::pair<_Iter, _Iter> 34 __unique(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) { 35 __identity __proj; 36 __first = std::__adjacent_find(__first, __last, __pred, __proj); 37 if (__first != __last) { 38 // ... a a ? ... 39 // f i 40 _Iter __i = __first; 41 for (++__i; ++__i != __last;) 42 if (!__pred(*__first, *__i)) 43 *++__first = _IterOps<_AlgPolicy>::__iter_move(__i); 44 ++__first; 45 return std::pair<_Iter, _Iter>(std::move(__first), std::move(__i)); 46 } 47 return std::pair<_Iter, _Iter>(__first, __first); 48 } 49 50 template <class _ForwardIterator, class _BinaryPredicate> 51 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 52 unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) { 53 return std::__unique<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred).first; 54 } 55 56 template <class _ForwardIterator> 57 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 58 unique(_ForwardIterator __first, _ForwardIterator __last) { 59 return std::unique(__first, __last, __equal_to()); 60 } 61 62 _LIBCPP_END_NAMESPACE_STD 63 64 _LIBCPP_POP_MACROS 65 66 #endif // _LIBCPP___ALGORITHM_UNIQUE_H 67