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 <__config> 13 #include <__algorithm/comp.h> 14 #include <__algorithm/adjacent_find.h> 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_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 // unique 28 29 template <class _ForwardIterator, class _BinaryPredicate> 30 _LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator 31 unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred) 32 { 33 __first = _VSTD::adjacent_find<_ForwardIterator, _BinaryPredicate&>(__first, __last, __pred); 34 if (__first != __last) 35 { 36 // ... a a ? ... 37 // f i 38 _ForwardIterator __i = __first; 39 for (++__i; ++__i != __last;) 40 if (!__pred(*__first, *__i)) 41 *++__first = _VSTD::move(*__i); 42 ++__first; 43 } 44 return __first; 45 } 46 47 template <class _ForwardIterator> 48 _LIBCPP_NODISCARD_EXT inline 49 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 50 _ForwardIterator 51 unique(_ForwardIterator __first, _ForwardIterator __last) 52 { 53 typedef typename iterator_traits<_ForwardIterator>::value_type __v; 54 return _VSTD::unique(__first, __last, __equal_to<__v>()); 55 } 56 57 _LIBCPP_END_NAMESPACE_STD 58 59 _LIBCPP_POP_MACROS 60 61 #endif // _LIBCPP___ALGORITHM_UNIQUE_H 62