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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_UNIQUE_H
#define _LIBCPP___ALGORITHM_UNIQUE_H
#include <__algorithm/adjacent_find.h>
#include <__algorithm/comp.h>
#include <__algorithm/iterator_operations.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
// unique
template <class _AlgPolicy, class _Iter, class _Sent, class _BinaryPredicate>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 std::pair<_Iter, _Iter>
__unique(_Iter __first, _Sent __last, _BinaryPredicate&& __pred) {
__first = std::__adjacent_find(__first, __last, __pred);
if (__first != __last) {
// ... a a ? ...
// f i
_Iter __i = __first;
for (++__i; ++__i != __last;)
if (!__pred(*__first, *__i))
*++__first = _IterOps<_AlgPolicy>::__iter_move(__i);
++__first;
return std::pair<_Iter, _Iter>(std::move(__first), std::move(__i));
}
return std::pair<_Iter, _Iter>(__first, __first);
}
template <class _ForwardIterator, class _BinaryPredicate>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) {
return std::__unique<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred).first;
}
template <class _ForwardIterator>
_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
unique(_ForwardIterator __first, _ForwardIterator __last) {
return std::unique(__first, __last, __equal_to());
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_UNIQUE_H
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