ca7926bd79
When `_Compare` is a function parameter already (so it's not `void` and it's not an abominable function type), `add_lvalue_reference_t<_Compare>` is simply a synonym for `_Compare&`. We don't need to pull in `<type_traits>` and instantiate a template trait to figure that out. Differential Revision: https://reviews.llvm.org/D108400
62 lines
1.8 KiB
C++
62 lines
1.8 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_H
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#define _LIBCPP___ALGORITHM_UNIQUE_H
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#include <__config>
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#include <__algorithm/comp.h>
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#include <__algorithm/adjacent_find.h>
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#include <__iterator/iterator_traits.h>
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#include <__utility/move.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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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// unique
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template <class _ForwardIterator, class _BinaryPredicate>
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_LIBCPP_NODISCARD_EXT _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
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unique(_ForwardIterator __first, _ForwardIterator __last, _BinaryPredicate __pred)
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{
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__first = _VSTD::adjacent_find<_ForwardIterator, _BinaryPredicate&>(__first, __last, __pred);
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if (__first != __last)
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{
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// ... a a ? ...
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// f i
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_ForwardIterator __i = __first;
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for (++__i; ++__i != __last;)
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if (!__pred(*__first, *__i))
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*++__first = _VSTD::move(*__i);
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++__first;
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}
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return __first;
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}
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template <class _ForwardIterator>
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_LIBCPP_NODISCARD_EXT inline
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator
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unique(_ForwardIterator __first, _ForwardIterator __last)
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{
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typedef typename iterator_traits<_ForwardIterator>::value_type __v;
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return _VSTD::unique(__first, __last, __equal_to<__v>());
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_UNIQUE_H
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