source: GTP/trunk/App/Demos/Geom/include/CEGUI/CEGUIIteratorBase.h @ 1030

/************************************************************************
        filename:       CEGUIIteratorBase.h
        created:        26/7/2004
        author:         Paul D Turner
        
        purpose:        Defines interface for base iterator class
*************************************************************************/
/*************************************************************************
    Crazy Eddie's GUI System (http://www.cegui.org.uk)
    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/
/*************************************************************************
        This is based somewhat on MapIterator in the Ogre library (www.ogre3d.org)
*************************************************************************/
#ifndef _CEGUIIteratorBase_h_
#define _CEGUIIteratorBase_h_

#include "CEGUIBase.h"


// Start of CEGUI namespace section
namespace CEGUI
{
/*!
\brief
        Base class constant iterator used to offer iteration over various collections within the system.
*/
template<class T>
class ConstBaseIterator
{
public:
#if defined(_MSC_VER) && (_MSC_VER <= 1200) && !defined(_STLPORT_VERSION)
        typedef typename T::referent_type       mapped_type;
#else
        typedef typename T::mapped_type         mapped_type;
#endif

        /*!
        \brief
                ConstBaseIterator constructor

        \param start_iter
                'real' iterator that will be the start of the range to be iterated over by this iterator.

        \param end_iter
                'real' iterator that will be the end of the range to be iterated over by this iterator.
        */
        ConstBaseIterator(typename T::const_iterator start_iter, typename T::const_iterator end_iter) :
                d_currIter(start_iter),
                d_startIter(start_iter),
                d_endIter(end_iter)
        {
        }

        
        /*!
        \brief
                ConstBaseIterator destructor
        */
        ~ConstBaseIterator(void)
        {
        }


        /*!
        \brief
                ConstBaseIterator copy constructor
        */
        ConstBaseIterator(const ConstBaseIterator<T>& org) :
                d_currIter(org.d_currIter),
                d_startIter(org.d_startIter),
                d_endIter(org.d_endIter)
        {
        }


        /*!
        \brief
                ConstBaseIterator assignment operator
        */
        ConstBaseIterator<T>&   operator=(const ConstBaseIterator<T>& rhs)
        {
                d_currIter      = rhs.d_currIter;
                d_startIter     = rhs.d_startIter;
                d_endIter       = rhs.d_endIter;

                return *this;
        }


        /*!
        \brief
                Return the key for the item at the current iterator position.
        */
        typename T::key_type    getCurrentKey(void) const
        {
                return d_currIter->first;
        }


        /*!
        \brief
                Return the value for the item at the current iterator position.
        */
        mapped_type     getCurrentValue(void) const
        {
                return d_currIter->second;
        }


        /*!
        \brief
                Return whether the current iterator position is at the end of the iterators range.
        */
        bool    isAtEnd(void) const
        {
                return d_currIter == d_endIter;
        }


        /*!
        \brief
                Return whether the current iterator position is at the start of the iterators range.
        */
        bool    isAtStart(void) const
        {
                return d_currIter == d_startIter;
        }


        /*!
        \brief
                Increase the iterator position (prefix increment).

        \note
                The iterator is checked, and this call will always succeed, so do not rely on some exception to exit a loop.
        */
        ConstBaseIterator<T>&   operator++()
        {
                if (d_currIter != d_endIter)
                        ++d_currIter;

                return *this;
        }


        /*!
        \brief
                Increase the iterator position (postfix increment).

        \note
                The iterator is checked, and this call will always succeed, so do not rely on some exception to exit a loop.
        */
        ConstBaseIterator<T>    operator++(int)
        {
                ConstBaseIterator<T> tmp = *this;
                ++*this;

                return tmp;
        }


        /*!
        \brief
                Decrease the iterator position (prefix decrement).

        \note
                The iterator is checked, and this call will always succeed, so do not rely on some exception to exit a loop.
        */
        ConstBaseIterator<T>&   operator--()
        {
                if (d_currIter != d_startIter)
                        --d_currIter;

                return *this;
        }


        /*!
        \brief
                Decrease the iterator position (postfix decrement).

        \note
                The iterator is checked, and this call will always succeed, so do not rely on some exception to exit a loop.
        */
        ConstBaseIterator<T>    operator--(int)
        {
                ConstBaseIterator<T> tmp = *this;
                --*this;

                return tmp;
        }


        /*!
        \brief
                Compares two iterators.  Return true if the current position of both iterators are equivalent.
        */
        bool    operator==(const ConstBaseIterator<T>& rhs) const
        {
                return d_currIter == rhs.d_currIter;
        }


        /*!
        \brief
                Compares two iterators.  Return true if the current position of the iterators are different.
        */
        bool    operator!=(const ConstBaseIterator<T>& rhs) const
        {
                return !this == rhs;
        }


        /*!
        \brief
                Return the value for the current iterator position.
        */
        mapped_type     operator*() const
        {
                return d_currIter->second;
        }


        /*!
        \brief
                Set the iterator current position to the start position.
        */
        void    toStart(void)
        {
                d_currIter = d_startIter;
        }


        /*!
        \brief
                Set the iterator current position to the end position.
        */
        void    toEnd(void)
        {
                d_currIter = d_endIter;
        }


private:
        /*************************************************************************
                No default construction available
        *************************************************************************/
        ConstBaseIterator(void) {}

        /*************************************************************************
                Implementation Data
        *************************************************************************/
        typename T::const_iterator      d_currIter;             //!< 'real' iterator describing the current position within the collection.
        typename T::const_iterator      d_startIter;    //!< 'real' iterator describing the start position within the collection (or what we were told was the start).
        typename T::const_iterator      d_endIter;              //!< 'real' iterator describing the end position within the collection (or what we were told was the end).
};

} // End of  CEGUI namespace section


#endif  // end of guard _CEGUIIteratorBase_h_