ial">::</span><span class="identifier">lit</span><span class="special">;</span>
</pre>
<p>
          </p>
<p>
            Basic usage of an <code class="computeroutput"><span class="identifier">double_</span></code>
            generator:
          </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">test_generator</span><span class="special">(</span><span class="string">"2.0"</span><span class="special">,</span> <span class="identifier">lit</span><span class="special">(</span><span class="num