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 <__config> 15 #include <__iterator/iterator_traits.h> 16 #include <__utility/move.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 # pragma clang include_instead(<algorithm>) 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 // unique 26 27 template <class _ForwardIterator, class _BinaryPredicate> 28 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator 29 unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) 30 { 31 __first = _VSTD::adjacent_find<_ForwardIterator, _BinaryPredicate&>(__first, __last, __pred); 32 if (__first != __last) 33 { 34 // ... a a ? ... 35 // f i 36 _ForwardIterator __i = __first; 37 for (++__i; ++__i != __last;) 38 if (!__pred(*__first, *__i)) 39 *++__first = _VSTD::move(*__i); 40 ++__first; 41 } 42 return __first; 43 } 44 45 template <class _ForwardIterator> 46 _LIBCPP_NODISCARD_EXT inline 47 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 48 _ForwardIterator 49 unique(_ForwardIterator __first, _ForwardIterator __last) 50 { 51 typedef typename iterator_traits<_ForwardIterator>::value_type __v; 52 return _VSTD::unique(__first, __last, __equal_to<__v>()); 53 } 54 55 _LIBCPP_END_NAMESPACE_STD 56 57 #endif // _LIBCPP___ALGORITHM_UNIQUE_H 58