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 28template <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 45template <class _ForwardIterator, class _BinaryPredicate> 46_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 47unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) { 48 return std::__unique<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred).first; 49} 50 51template <class _ForwardIterator> 52_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 53unique(_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