1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___ALGORITHM_UNIQUE_H
10 #define _LIBCPP___ALGORITHM_UNIQUE_H
12 #include <__algorithm/adjacent_find.h>
13 #include <__algorithm/comp.h>
15 #include <__iterator/iterator_traits.h>
16 #include <__utility/move.h>
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 # pragma GCC system_header
22 _LIBCPP_BEGIN_NAMESPACE_STD
26 template <class _ForwardIterator, class _BinaryPredicate>
27 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
28 unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred)
30 __first = _VSTD::adjacent_find<_ForwardIterator, _BinaryPredicate&>(__first, __last, __pred);
31 if (__first != __last)
35 _ForwardIterator __i = __first;
36 for (++__i; ++__i != __last;)
37 if (!__pred(*__first, *__i))
38 *++__first = _VSTD::move(*__i);
44 template <class _ForwardIterator>
45 _LIBCPP_NODISCARD_EXT inline
46 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
48 unique(_ForwardIterator __first, _ForwardIterator __last)
50 typedef typename iterator_traits<_ForwardIterator>::value_type __v;
51 return _VSTD::unique(__first, __last, __equal_to<__v>());
54 _LIBCPP_END_NAMESPACE_STD
56 #endif // _LIBCPP___ALGORITHM_UNIQUE_H