  Generation</a>
</h3></div></div></div>
<p>
        Like C++ <code class="computeroutput">#ifdef</code>, you can generate phrases depending on the presence
        of a macro. Example:
      </p>
<pre class="programlisting">[? __to_be__ To be or not to be]
</pre>
<p>
        Here, the phrase "To be or not to be" will only be generated if
        the macro symbol <code class="computeroutput">__to_be__</code> has been previously defined. The
        phrase above will not do anything since we haven't defined 