107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_UNIQUE_COPY_H
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#define _LIBCPP___ALGORITHM_UNIQUE_COPY_H
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#include <__algorithm/comp.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _BinaryPredicate, class _InputIterator, class _OutputIterator>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
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__unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred,
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input_iterator_tag, output_iterator_tag)
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{
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if (__first != __last)
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{
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typename iterator_traits<_InputIterator>::value_type __t(*__first);
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*__result = __t;
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++__result;
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while (++__first != __last)
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{
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if (!__pred(__t, *__first))
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{
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__t = *__first;
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*__result = __t;
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++__result;
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}
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}
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}
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return __result;
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}
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template <class _BinaryPredicate, class _ForwardIterator, class _OutputIterator>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
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__unique_copy(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __result, _BinaryPredicate __pred,
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forward_iterator_tag, output_iterator_tag)
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{
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if (__first != __last)
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{
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_ForwardIterator __i = __first;
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*__result = *__i;
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++__result;
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while (++__first != __last)
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{
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if (!__pred(*__i, *__first))
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{
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*__result = *__first;
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++__result;
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__i = __first;
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}
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}
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}
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return __result;
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}
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template <class _BinaryPredicate, class _InputIterator, class _ForwardIterator>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
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__unique_copy(_InputIterator __first, _InputIterator __last, _ForwardIterator __result, _BinaryPredicate __pred,
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input_iterator_tag, forward_iterator_tag)
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{
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if (__first != __last)
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{
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*__result = *__first;
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while (++__first != __last)
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if (!__pred(*__result, *__first))
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*++__result = *__first;
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++__result;
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}
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return __result;
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}
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template <class _InputIterator, class _OutputIterator, class _BinaryPredicate>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_OutputIterator
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unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred)
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{
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return _VSTD::__unique_copy<_BinaryPredicate&>(__first, __last, __result, __pred,
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typename iterator_traits<_InputIterator>::iterator_category(),
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typename iterator_traits<_OutputIterator>::iterator_category());
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}
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template <class _InputIterator, class _OutputIterator>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_OutputIterator
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unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result)
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{
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typedef typename iterator_traits<_InputIterator>::value_type __v;
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return _VSTD::unique_copy(__first, __last, __result, __equal_to<__v>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_UNIQUE_COPY_H
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