gistfile1.txt

// *** Design #1: helper class

    if (AutoFinallyBlock afb(cx, ok)) {
        bool closedOK = CLOSE THE ITERATOR;
        ok = afb.leave(closedOK);
    }

// *** Design #2: no helper class

    if (ok || cx->isExceptionPending()) {
        Value exc;
        if (!ok) {
            exc = cx->getPendingException();
            cx->clearPendingException();
        }
        bool closedOK = CLOSE THE ITERATOR;
        if (!ok && closedOK)
            cx->setPendingException(exc);
        ok = ok && closedOK;
    }