--- /dev/null
+// Types used in iterator implementation -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_iterator_base_types.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{iterator}
+ *
+ * This file contains all of the general iterator-related utility types,
+ * such as iterator_traits and struct iterator.
+ */
+
+#ifndef _STL_ITERATOR_BASE_TYPES_H
+#define _STL_ITERATOR_BASE_TYPES_H 1
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+# include <type_traits> // For _GLIBCXX_HAS_NESTED_TYPE
+#endif
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @defgroup iterators Iterators
+ * Abstractions for uniform iterating through various underlying types.
+ */
+ //@{
+
+ /**
+ * @defgroup iterator_tags Iterator Tags
+ * These are empty types, used to distinguish different iterators. The
+ * distinction is not made by what they contain, but simply by what they
+ * are. Different underlying algorithms can then be used based on the
+ * different operations supported by different iterator types.
+ */
+ //@{
+ /// Marking input iterators.
+ struct input_iterator_tag { };
+
+ /// Marking output iterators.
+ struct output_iterator_tag { };
+
+ /// Forward iterators support a superset of input iterator operations.
+ struct forward_iterator_tag : public input_iterator_tag { };
+
+ /// Bidirectional iterators support a superset of forward iterator
+ /// operations.
+ struct bidirectional_iterator_tag : public forward_iterator_tag { };
+
+ /// Random-access iterators support a superset of bidirectional
+ /// iterator operations.
+ struct random_access_iterator_tag : public bidirectional_iterator_tag { };
+ //@}
+
+ /**
+ * @brief Common %iterator class.
+ *
+ * This class does nothing but define nested typedefs. %Iterator classes
+ * can inherit from this class to save some work. The typedefs are then
+ * used in specializations and overloading.
+ *
+ * In particular, there are no default implementations of requirements
+ * such as @c operator++ and the like. (How could there be?)
+ */
+ template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
+ typename _Pointer = _Tp*, typename _Reference = _Tp&>
+ struct iterator
+ {
+ /// One of the @link iterator_tags tag types@endlink.
+ typedef _Category iterator_category;
+ /// The type "pointed to" by the iterator.
+ typedef _Tp value_type;
+ /// Distance between iterators is represented as this type.
+ typedef _Distance difference_type;
+ /// This type represents a pointer-to-value_type.
+ typedef _Pointer pointer;
+ /// This type represents a reference-to-value_type.
+ typedef _Reference reference;
+ };
+
+ /**
+ * @brief Traits class for iterators.
+ *
+ * This class does nothing but define nested typedefs. The general
+ * version simply @a forwards the nested typedefs from the Iterator
+ * argument. Specialized versions for pointers and pointers-to-const
+ * provide tighter, more correct semantics.
+ */
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+
+_GLIBCXX_HAS_NESTED_TYPE(iterator_category)
+
+ template<typename _Iterator,
+ bool = __has_iterator_category<_Iterator>::value>
+ struct __iterator_traits { };
+
+ template<typename _Iterator>
+ struct __iterator_traits<_Iterator, true>
+ {
+ typedef typename _Iterator::iterator_category iterator_category;
+ typedef typename _Iterator::value_type value_type;
+ typedef typename _Iterator::difference_type difference_type;
+ typedef typename _Iterator::pointer pointer;
+ typedef typename _Iterator::reference reference;
+ };
+
+ template<typename _Iterator>
+ struct iterator_traits
+ : public __iterator_traits<_Iterator> { };
+#else
+ template<typename _Iterator>
+ struct iterator_traits
+ {
+ typedef typename _Iterator::iterator_category iterator_category;
+ typedef typename _Iterator::value_type value_type;
+ typedef typename _Iterator::difference_type difference_type;
+ typedef typename _Iterator::pointer pointer;
+ typedef typename _Iterator::reference reference;
+ };
+#endif
+
+ /// Partial specialization for pointer types.
+ template<typename _Tp>
+ struct iterator_traits<_Tp*>
+ {
+ typedef random_access_iterator_tag iterator_category;
+ typedef _Tp value_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Tp* pointer;
+ typedef _Tp& reference;
+ };
+
+ /// Partial specialization for const pointer types.
+ template<typename _Tp>
+ struct iterator_traits<const _Tp*>
+ {
+ typedef random_access_iterator_tag iterator_category;
+ typedef _Tp value_type;
+ typedef ptrdiff_t difference_type;
+ typedef const _Tp* pointer;
+ typedef const _Tp& reference;
+ };
+
+ /**
+ * This function is not a part of the C++ standard but is syntactic
+ * sugar for internal library use only.
+ */
+ template<typename _Iter>
+ inline typename iterator_traits<_Iter>::iterator_category
+ __iterator_category(const _Iter&)
+ { return typename iterator_traits<_Iter>::iterator_category(); }
+
+ //@}
+
+ // If _Iterator has a base returns it otherwise _Iterator is returned
+ // untouched
+ template<typename _Iterator, bool _HasBase>
+ struct _Iter_base
+ {
+ typedef _Iterator iterator_type;
+ static iterator_type _S_base(_Iterator __it)
+ { return __it; }
+ };
+
+ template<typename _Iterator>
+ struct _Iter_base<_Iterator, true>
+ {
+ typedef typename _Iterator::iterator_type iterator_type;
+ static iterator_type _S_base(_Iterator __it)
+ { return __it.base(); }
+ };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif /* _STL_ITERATOR_BASE_TYPES_H */
+
projects / cross.git / blobdiff