gxAutoPtr.h

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/*  Copyright (C) 2004  Guido Simone
 *
 *  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 GXLIB_GXAUTOPTR_H
#define GXLIB_GXAUTOPTR_H

template<class T>
class gxAutoPtr
{
public:
   gxAutoPtr( T * ptr = NULL ) 
   { 
      m_ptr = ptr; 
   }

   virtual ~gxAutoPtr() 
   { 
      clear();
   }

   T ** operator&()
   {
      return &m_ptr;
   }

   T* operator->() { return m_ptr; }

   bool operator==(gxAutoPtr<T> & rhs) 
   { 
      return m_ptr == rhs.m_ptr; 
   }

   bool operator==(T * rhs) 
   { 
      return m_ptr == rhs; 
   }

   gxAutoPtr & operator=( T * rhs )
   {
      assign(rhs);
      return *this;
   }

   operator T *()
   {
      return m_ptr;
   }
   void clear()
   {
      if ( m_ptr != NULL )
      {
         delete m_ptr;
         m_ptr = NULL;
      }
   }

   void assign( T * rhs )
   {
      clear();
      m_ptr = rhs;
   }

   T* detach( )
   {
      T * result = m_ptr;
      m_ptr = NULL;
      return result;
   }

   T * m_ptr;

private:
   // do not implement
   gxAutoPtr( const gxAutoPtr & rhs);
   gxAutoPtr & operator=( const gxAutoPtr & rhs);
};


#endif

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