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IMG_MemPtr.h

/**
 * $Id: IMG_MemPtr.h,v 1.6 2002/12/26 18:25:15 mein Exp $
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * 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. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

/**

 * @author  Maarten Gribnau
 * @date    March 8, 2001
 */

#ifndef _H_IMG_MemPtr
#define _H_IMG_MemPtr

#include <stddef.h>

/**
 * A memory pointer for memory of any type.
 * It can be used to avoid memory leaks when allocating memory in constructors.
 * @author  Maarten Gribnau
 * @date    March 8, 2001
 */

00050 template <class T> class IMG_MemPtr {
public:
      /** Pointer to the memory */
00053       T* m_p;
      bool m_owned;

      /**
       * Size exception.
       * A size exception is thrown when an invalid width and/or height is passed.
       */
00060       class Size {};
      /**
       * Memory exception.
       * A size exception is thrown when a there is not enough memory to allocate the image.
       */
00065       class Memory {};

      /**
       * Constructs a memory pointer.
       * @param   s     requested size of the pointer
       * @throw <Size>  when an invalid width and/or height is passed.
       * @throw <Memory>      when a there is not enough memory to allocate the image.
       */
00073       IMG_MemPtr(size_t s)
            : m_p(0), m_owned(false)
      {
            if (s > 0) {
                  m_p = new T[s];
                  if (!m_p) {
                        throw Memory();
                  }
                  m_owned = true;
            }
            else {
                  throw Size();
            }
      }

      /**
       * Constructs a memory pointer from a pointer.
       * @param   p     the pointer
       * @param   s     requested size of the pointer
       * @throw <Size>  when an invalid width and/or height is passed.
       */
00094       IMG_MemPtr(void* p, size_t s)
            : m_p(0), m_owned(false)
      {
            if (p && (s > 0)) {
                  m_p = (T*)p;
            }
            else {
                  throw Size();
            }
      }

      /**
       * Destructor.
       */
00108       ~IMG_MemPtr() { if (m_p && m_owned) { delete [] m_p; m_p = 0; } }

      /**
       * Access to the memory.
       * @return  pointer to the memory
       */
00114       operator T*() { return m_p; }
};

#endif /* _H_IMG_MemPtr */


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