smartptr.h

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#ifndef _PSMARTPTR_H
#define _PSMARTPTR_H

#include <ptlib.h>
#include <ptlib/object.h>

// "Smart" pointers.

class PSmartObject : public PObject
{
  PCLASSINFO(PSmartObject, PObject);

  public:
    PSmartObject()
      :referenceCount(1) { }

  protected:
    PAtomicInteger referenceCount;


  friend class PSmartPointer;
};


class PSmartPointer : public PObject
{
  PCLASSINFO(PSmartPointer, PObject);

  public:
    PSmartPointer(
      PSmartObject * obj = NULL   
    ) { object = obj; }

    PSmartPointer(
      const PSmartPointer & ptr  
    );

    virtual ~PSmartPointer();

    PSmartPointer & operator=(
      const PSmartPointer & ptr  
    );

    virtual Comparison Compare(
      const PObject & obj   // Other smart pointer to compare against.
    ) const;

    BOOL IsNULL() const { return object == NULL; }

    PSmartObject * GetObject() const { return object; }

  protected:
    // Member variables
    PSmartObject * object;
};


template <class T> class PSmartPtr : public PSmartPointer
{
  PCLASSINFO(PSmartPtr, PSmartPointer);
  public:
    PSmartPtr(T * ptr = NULL)
      : PSmartPointer(ptr) { }

    T * operator->() const
      { return (T *)PAssertNULL(object); }

    T & operator*() const
      { return *(T *)PAssertNULL(object); }

    operator T*() const
      { return (T *)object; }
};


#endif

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