TReference.hxx

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#ifndef _TREFERENCE_HXX_
#define _TREFERENCE_HXX_


class TReference 
{
 public :
    TReference() {fNbReferences=0;} 
    virtual ~TReference() {}        
    
    void AddReference(unsigned n=1) {fNbReferences+=n;} 
    unsigned DelReference(unsigned n=1) {fNbReferences-=n; return fNbReferences;} 
    unsigned Reference(){return fNbReferences;} 
 private :
    unsigned fNbReferences; 

};


template <class T> class Reference_ptr 
{
 private:
    T* ptr; 

public:
    explicit Reference_ptr(T* p = 0) {ptr=p; if (ptr) ptr->AddReference();} 
    Reference_ptr(const Reference_ptr& r) {ptr=r.ptr;ptr->AddReference();} 
    ~Reference_ptr() {if(ptr && ptr->DelReference()==0) delete ptr;} 
    T& operator*() const {return *ptr;} 
    T* operator->() const {return ptr;} 
    T* Get() const {return ptr;} 
    
    Reference_ptr& operator=(const Reference_ptr& r) 
    {
        if (ptr != r.ptr)
        {
            if(ptr && ptr->DelReference()==0) delete ptr;
            ptr=r.ptr;
            if (ptr) ptr->AddReference();
        }
        return *this;
    }
    
    Reference_ptr& operator=(T* p) 
    {
        if (ptr != p) 
        {
            if(ptr && ptr->DelReference()==0) delete ptr;
            ptr=p; 
            if (ptr) ptr->AddReference(); 
        }
        return *this;
    }
    
    bool operator==(T *p) {return ptr==p;} 
    bool operator!=(T *p) {return ptr!=p;} 
};

#endif