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Reference.hpp

/*      Reference.hpp - Morpheous
 *
 *  $Header$
 *
 *  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 Library 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 __REFERENCE_HPP__
#define __REFERENCE_HPP__

#include <hash_map>


template <class T>
class Reference
{
private:
    static std::hash_map<T*, int> map;

    T* ptr;

public:
    Reference(T* ptr)
    {
        this->ptr = ptr;
    
        if(map.count(ptr) == 0)
        {
            map[ptr] = 0;
        }
        map[ptr]++;
    }

    ~Reference()
    {
        map[ptr]--;
        if(map[ptr] == 0)
        {
            map.erase(ptr);
            delete ptr;
        }
    
        ptr = NULL;
    }

    operator T*()
    {
        return ptr;
    }

    T* operator->()
    {
        return ptr;
    }
};
    
#endif // __REFERENCE_HPP__

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