if (mResultThread) { *aItem = mResultThread; NS_ADDREF(mResultThread);
if (mResultHdr) { *aItem = mResultHdr; NS_ADDREF(mResultHdr);
NS_IMETHODIMP nsMsgDBThreadEnumerator::CurrentItem(nsISupports **aItem){    if (mResultThread) 	{        *aItem = mResultThread;        NS_ADDREF(mResultThread);        return NS_OK;    }    return NS_ERROR_FAILURE;}