1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_UNIQUE_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_UNIQUE_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__algorithm/adjacent_find.h> 1373fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp.h> 1473fbae83SNikolas Klauser #include <__cxx03/__algorithm/iterator_operations.h> 1573fbae83SNikolas Klauser #include <__cxx03/__config> 1673fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h> 1773fbae83SNikolas Klauser #include <__cxx03/__utility/move.h> 1873fbae83SNikolas Klauser #include <__cxx03/__utility/pair.h> 19e78f53d1SNikolas Klauser 20e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21e78f53d1SNikolas Klauser # pragma GCC system_header 22e78f53d1SNikolas Klauser #endif 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2573fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 26e78f53d1SNikolas Klauser 27e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 28e78f53d1SNikolas Klauser 29e78f53d1SNikolas Klauser // unique 30e78f53d1SNikolas Klauser 31e78f53d1SNikolas Klauser template <class _AlgPolicy, class _Iter, class _Sent, class _BinaryPredicate> 32e78f53d1SNikolas Klauser _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 std::pair<_Iter, _Iter> 33e78f53d1SNikolas Klauser __unique(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) { 34e78f53d1SNikolas Klauser __first = std::__adjacent_find(__first, __last, __pred); 35e78f53d1SNikolas Klauser if (__first != __last) { 36e78f53d1SNikolas Klauser // ... a a ? ... 37e78f53d1SNikolas Klauser // f i 38e78f53d1SNikolas Klauser _Iter __i = __first; 39e78f53d1SNikolas Klauser for (++__i; ++__i != __last;) 40e78f53d1SNikolas Klauser if (!__pred(*__first, *__i)) 41e78f53d1SNikolas Klauser *++__first = _IterOps<_AlgPolicy>::__iter_move(__i); 42e78f53d1SNikolas Klauser ++__first; 43e78f53d1SNikolas Klauser return std::pair<_Iter, _Iter>(std::move(__first), std::move(__i)); 44e78f53d1SNikolas Klauser } 45e78f53d1SNikolas Klauser return std::pair<_Iter, _Iter>(__first, __first); 46e78f53d1SNikolas Klauser } 47e78f53d1SNikolas Klauser 48e78f53d1SNikolas Klauser template <class _ForwardIterator, class _BinaryPredicate> 49e78f53d1SNikolas Klauser _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 50e78f53d1SNikolas Klauser unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) { 51e78f53d1SNikolas Klauser return std::__unique<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred).first; 52e78f53d1SNikolas Klauser } 53e78f53d1SNikolas Klauser 54e78f53d1SNikolas Klauser template <class _ForwardIterator> 55e78f53d1SNikolas Klauser _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator 56e78f53d1SNikolas Klauser unique(_ForwardIterator __first, _ForwardIterator __last) { 57e78f53d1SNikolas Klauser return std::unique(__first, __last, __equal_to()); 58e78f53d1SNikolas Klauser } 59e78f53d1SNikolas Klauser 60e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 61e78f53d1SNikolas Klauser 62e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 63e78f53d1SNikolas Klauser 64*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_UNIQUE_H 65