n><span class="identifier">double_</span>
</pre>
<p>
          This is like a regular-expression Kleene Star, though the syntax might
          look a bit odd for a C++ programmer not used to seeing the <code class="computeroutput"><span class="special">*</span></code> operator overloaded like this. Actually,
          if you know regular expressions it may look odd too since the star is before
          the expression it modifies. C'est la vie. Blame it on the fact that we
          must work with the synt