Ptr.hpp

Go to the documentation of this file.

/*****************************************************************************
 * Copyright (C) 2011 by Benjamin Hadorn (b_hadorn@bluewin.ch)
 *****************************************************************************
 * Project    : Zeus Base Library
 * Module     : Ptr
 * Package    : Zeus.ZeusBase.System
 * Author     : Benjamin Hadorn
 * Date       : 27.12.2011
 * System     : Zeus-Framework
 *****************************************************************************
 * Licence:                                                                  *
 *   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., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA    *
 *****************************************************************************/

/*****************************************************************************
 * Changes:
 *  27.12.2011 bha: created zeus 2.0
 *****************************************************************************/

#ifndef PtrHPP
#define PtrHPP

#include <zeusbase/System/Interfaces/IZUnknown.hpp>

BEGIN_NAMESPACE_Zeus


/**************************************************************************/
/**************************************************************************/
template <class T> class TPtr
{
  public:
    
    /***********************************************************************/
    /***********************************************************************/
    inline TPtr()
    {
      m_pPtr = NULL;
      m_pReferenceCounter = NULL;
    }
    
    /***********************************************************************/
    /***********************************************************************/
    TPtr(const T* pPtr)
    {
      m_pReferenceCounter = NULL;
      m_pPtr = (T*)pPtr;
      if (m_pPtr != NULL)
      {
        m_pReferenceCounter = new Int();
        *m_pReferenceCounter = 1;
      }
    }

    /***********************************************************************/
    /***********************************************************************/
    inline TPtr(const T& rPtr)
    {
      m_pPtr = (T*)(&rPtr);
      m_pReferenceCounter = new Int();
      *m_pReferenceCounter = 1;
    }

    /***********************************************************************/
    /***********************************************************************/
    inline TPtr(const TPtr<T>& rWrapper)
    {
      m_pPtr = NULL;
      m_pReferenceCounter = NULL;
      assignWrapper(rWrapper);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline virtual ~TPtr()
    {
      release();
    }

    /***********************************************************************/
    /***********************************************************************/
    void assignWrapper(const TPtr& rWrapper)
    {
      release();
      m_pPtr = rWrapper.m_pPtr;
      m_pReferenceCounter = rWrapper.m_pReferenceCounter;
      if (m_pPtr != NULL && m_pReferenceCounter != NULL && *m_pReferenceCounter > 0)
      {
        (*m_pReferenceCounter)++;
      }
      else
      {
        m_pPtr = NULL;
        m_pReferenceCounter = NULL;
      }
    }

    /***********************************************************************/
    /***********************************************************************/
    void assign(const T* pInterface)
    {
      release();
      m_pPtr = (T*)pInterface;
      if (m_pPtr != NULL)
      {
        m_pReferenceCounter = new Int();
        *m_pReferenceCounter = 1;
      }
    }

    /***********************************************************************/
    /***********************************************************************/
    inline bool equals(const T* pPtr) const
    {
      return (m_pPtr == pPtr);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline T* getPointer()
    {
      return m_pPtr;
    }

    /***********************************************************************/
    /***********************************************************************/
    inline const T* getConstPointer() const
    {
      return m_pPtr;
    }

    /***********************************************************************/
    /***********************************************************************/
    void release()
    {
      if (this->m_pPtr != NULL)
      {
        (*m_pReferenceCounter)--;
        if (*m_pReferenceCounter <= 0)
        {
          delete this->m_pReferenceCounter;
          delete this->m_pPtr;
          this->m_pPtr = NULL;
          this->m_pReferenceCounter = NULL;
        } //(*m_pReferenceCounter <= 0)
      } //(this->m_pPtr != NULL)
    }
    
    /***********************************************************************/
    /***********************************************************************/
    inline TPtr<T>& operator=(const TPtr<T>& rWrapper)
    {
      assignWrapper(rWrapper);
      return *this;
    }

    /***********************************************************************/
    /***********************************************************************/
    inline TPtr<T>& operator=(const T* pPtr)
    {
      assign(pPtr);
      return *this;
    }

    /***********************************************************************/
    /***********************************************************************/
    inline TPtr<T>& operator=(const T& rPtr)
    {
      assign(&rPtr);
      return *this;
    }

    /***********************************************************************/
    /***********************************************************************/
    inline bool operator==(const TPtr<T>& rWrapper) const
    {
      return equals(rWrapper.m_pPtr);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline bool operator!=(const TPtr<T>& rWrapper) const
    {
      return !equals(rWrapper.m_pPtr);
    }
    
    /***********************************************************************/
    /***********************************************************************/
    inline bool operator==(const T* pPtr) const
    {
      return equals(pPtr);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline bool operator==(const T& rPtr) const
    {
      return equals(&rPtr);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline bool operator!=(const T* pPtr) const
    {
      return !equals(pPtr);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline bool operator!=(const T& rPtr) const
    {
      return !equals(&rPtr);
    }

    /***********************************************************************/
    /***********************************************************************/
    inline T* operator->() {return m_pPtr; }
    
    /***********************************************************************/
    /***********************************************************************/
    inline const T* operator->() const {return m_pPtr; }
    
    /***********************************************************************/
    /***********************************************************************/
    inline T& operator*() const {return *m_pPtr; }
    
    
    /***********************************************************************/
    /***********************************************************************/
    inline operator T*() const {return m_pPtr; }

  protected:
    T* m_pPtr;
    Int* m_pReferenceCounter;
};

END_NAMESPACE_Zeus

#endif