puteroutput"><span class="identifier">int_</span></code> is
          the sibling of <code class="computeroutput"><span class="identifier">double_</span></code>.
          I'm sure you can guess what this generator does and what type of attribute
          it expects.
        </p>
<p>
          The next example shows how to attach a simple function object:
        </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">generate</span><span class="special">(</span><span class="identifier">outiter<