Humble Framework for SkyOS

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HPtr.h

Go to the documentation of this file.

#ifndef HPTR_H
    #define HPTR_H
    
#ifndef HDEBUG_H
#   include "HDebug.h"
#endif
/*  ----------------------------------------------------------------------
    HPtr class -- clone of the standard auto_ptr() template class
    ----------------------------------------------------------------------  */
template <class T>
class HPtr 
    {
/*
**  Variables
*/
protected:
    T *                 m_pT;           
    uint32 *            m_puRefs;       
/*
**  Methods
*/
protected:
    void
    addRef(void)
        {
        ASSERT_PTR(m_puRefs);
        ++(*m_puRefs);
        }
    void
    delRef(void)
        {
        ASSERT_PTR(m_puRefs);
        ASSERT( *m_puRefs > 0 );
        
        if (--(*m_puRefs) == 0)
            {
            delete m_puRefs;
            delete m_pT;
            }
        }
public:
    uint32
    GetRefCount(void) const 
        { return GOOD_PTR(m_puRefs) ? *m_puRefs : 0; }
    bool
    IsNotValid(void) const
        { return NULL_PTR(m_pT); }
    bool
    IsValid(void) const
        { return GOOD_PTR(m_pT); }
//
//  OPERATORS
//
    HPtr<T> &
    operator = (const HPtr<T> & rhs) throw()
        {
        if (this != rhs)
            {
            delRef();
            m_pT = rhs.m_pT;
            m_puRefs = rhs.m_puRefs;
            addRef();
            }
            
        return *this;
        }
    
    T &
    operator * () const throw()
        { 
        ASSERT_PTR(m_pT);
        return *m_pT; 
        }
        
    T *
    operator -> () const throw()
        {
        ASSERT_PTR(m_pT);
        return m_pT;
        }
//
//  CTOR / DTOR
//
    explicit
    HPtr(T * p = NULL) : m_pT(p), m_puRefs(new uint32(0))
        { addRef(); }
    HPtr(const HPtr<T> & p) throw() : m_pT(p.m_pT), m_puRefs(p.m_puRefs)
        { addRef(); }
    
    ~HPtr() throw()
        { delRef(); }
    };

#endif  // HPTR_H
/****************************************************************************
**
**  $History: HPtr.h $
 * 
 * *****************  Version 1  *****************
 * User: Neusel       Date: 11/23/04   Time: 8:24a
 * Created in $/SkyOS.root/pig/Humble
**
**  -------------------------------------------------------------------------
**
**  End of HPtr.h
**
****************************************************************************/

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