nsCOMPtr( const nsCOMPtr_helper& helper ) : nsCOMPtr_base(0)
nsCOMPtr( const already_AddRefed<nsISupports>& aSmartPtr ) : nsCOMPtr_base(aSmartPtr.mRawPtr)
      nsCOMPtr( const nsCOMPtr_helper& helper )            : nsCOMPtr_base(0)          // ...and finally, anything else we might need to construct from          //  can exploit the |nsCOMPtr_helper| facility        {          NSCAP_LOG_ASSIGNMENT(this, 0);          assign_from_helper(helper, NS_GET_IID(nsISupports));        }