re>
<p>Without a result metafunction, notice that the parser's default attribute is 
  <tt>nil_t</tt> (i.e. the parser has no attribute).</p>
<h2><span class=special></span>parser_result</h2>
<p>Given a a scanner type <tt>ScannerT</tt> and a parser type <tt>ParserT</tt>, 
  what will be the actual result of the parser? The answer to this question is 
  provided to by the <tt>parser_result</tt> meta-function.</p>
<p>Usage:</p>
<pre>    <span class=keyword>typename </span><span class=identifier>parser_result<