ing_up.html#spirit.qi.tutorials.warming_up.trivial_example__1_parsing_a_number">Trivial
          Example #1 Parsing a number</a>
        </h6>
<p>
          Create a parser that will parse a floating-point number.
        </p>
<pre class="programlisting"><span class="identifier">double_</span>
</pre>
<p>
          (You've got to admit, that's trivial!) The above code actually generates
          a Spirit floating point parser (a built-in parser). Spirit has many pre-defined
          parsers and consistent