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//
// Filename : BaseIterator.h
// Author(s) : Stephane Grabli
// Purpose : Classes defining the basic "Iterator" design pattern
// Date of creation : 18/03/2003
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// This program 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 2
// of the License, or (at your option) any later version.
//
// This program 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.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef BASEITERATOR_H
# define BASEITERATOR_H
# include <iterator>
// use for iterators defintions
template <class Element>
class Nonconst_traits;
template <class Element>
class Const_traits {
public:
typedef Element value_type;
typedef const Element& reference;
typedef const Element* pointer;
typedef ptrdiff_t difference_type;
typedef Nonconst_traits<Element> Non_const_traits;
};
template <class Element>
class Nonconst_traits {
public:
typedef Element value_type;
typedef Element& reference;
typedef Element* pointer;
typedef ptrdiff_t difference_type;
typedef Nonconst_traits<Element> Non_const_traits;
};
class InputIteratorTag_Traits {
public:
typedef std::input_iterator_tag iterator_category;
};
class BidirectionalIteratorTag_Traits {
public:
typedef std::bidirectional_iterator_tag iterator_category;
};
template<class Traits, class IteratorTagTraits>
class IteratorBase
{
public:
virtual ~IteratorBase() {}
virtual bool begin() const = 0;
virtual bool end() const = 0;
typedef typename IteratorTagTraits::iterator_category iterator_category;
typedef typename Traits::value_type value_type;
typedef typename Traits::difference_type difference_type;
typedef typename Traits::pointer pointer;
typedef typename Traits::reference reference;
protected:
IteratorBase() {}
};
#endif // BASEITERATOR_H
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