base_smartptr.h

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/*

Copyright (c) 2008, Intel Corporation. 

All rights reserved.

 

Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:


    * Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation and/or 
other materials provided with the distribution.

    * Neither the name of Intel Corporation nor the names of its contributors 
may be used to endorse or promote products derived from this software without 
specific prior written permission.

 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.

*/

#ifndef _CLIENT_BASE_SMARTPTR_H
#define _CLIENT_BASE_SMARTPTR_H

#include <sstream>

using namespace std;

// ============================================================================
template <class T>
class SmartPtr
{
  protected:
    T* m_pObj;  
  
  public:
    //==================================
    // Default constructor
    SmartPtr( T* pObj = NULL ) : m_pObj( pObj ) 
    {
        if ( m_pObj )
        {
            m_pObj->AddRef();
        }
    }

    //==================================
    // Copy constructor
    SmartPtr( const SmartPtr& rhs )
    {
        if ( (m_pObj = rhs.m_pObj) != NULL )
        {
            m_pObj->AddRef();
        }
    }

    //==================================
    // Destructor
    ~SmartPtr() 
    {
        if ( m_pObj )
        {
            long lCount = m_pObj->Release();
        }
    }

    //==================================
    // Release
    void Release() 
    {
        if ( m_pObj )
        {
            m_pObj->Release(); 
        }

        m_pObj = NULL;
    }

    //==================================
    // operator=()
    T* operator=( T* pRhs )
    {
        if ( m_pObj ) 
        {
            m_pObj->Release();
        }

        if ( pRhs ) 
        {
            pRhs->AddRef();
        }

        m_pObj = pRhs;

        return m_pObj;

    } // operator=()


    //==================================
    // Implicit cast operator (Template function)
/*    template<class castTo>
    operator SmartPtr<castTo>()
    {
        return SmartPtr<castTo>( m_pObj );
    }
*/
    //==================================
    // Const access operators
 /*   operator const T*()    const { return  m_pObj; }
    const T& operator  *() const { return *m_pObj; }
    const T* operator ->() const { return  m_pObj; }

   */ //==================================
    // Non-const access operators
       operator T*()const { return  m_pObj; }
    T& operator  *()const  { return *m_pObj; }
    T* operator ->()const  { return  m_pObj; }
    T** operator &()  { return &m_pObj; }

    //==================================
    // Need this (to be used with STL) since copy-constructor takes const ref.
    SmartPtr& operator=( const SmartPtr& rhs ) // Eliminate implicit de-const via assignment
    {
        if ( rhs.m_pObj )
        {
            rhs.m_pObj->AddRef();
        }

        if ( m_pObj ) 
        {
            m_pObj->Release();
        }

        m_pObj = rhs.m_pObj;

        return *this;
    }

    //==================================
    // Logical operators
    bool operator !( )                     const { return m_pObj == NULL;       }
    bool operator <( const SmartPtr& rhs ) const { return m_pObj  < rhs.m_pObj; }
    bool operator >( const SmartPtr& rhs ) const { return m_pObj  > rhs.m_pObj; }
    bool operator==( const SmartPtr& rhs ) const { return m_pObj == rhs.m_pObj; }
};

//==============================================================================
#endif