if (!mElements || (mCount == 0) || (mCurrent == 0))
if (!mElements || (mCount == 0) || (mCurrent == 0)) { mDoneFlag = PR_TRUE;
nsHashtableEnumerator::Prev (){    if (!mElements || (mCount == 0) || (mCurrent == 0))        return NS_ERROR_FAILURE;    mCurrent--;    if (mCurrent == 0)        mDoneFlag = PR_TRUE;    else        mDoneFlag = PR_FALSE;    return NS_OK;    }