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