<span class=keyword>const</span><span class=special>;</span></pre>
<p>where <tt>RT</tt> is the desired return type of the parser. </p>
<h2>The parser result</h2>
<p>Concrete sub-classes inheriting from parser in most cases need to have a nested 
  meta-function <tt>result</tt> that returns the result <tt>type</tt> of the parser's 
  parse member function, given a scanner type. The meta-function has the form:</p>
<pre><span class=keyword>    template </span><span class=special>&lt;</span><span class=keyword>