<span class="identifier">I</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
          </p>
<p>
            The following sample program shows how the function can be called, we
            begin by defining a function object, which when integrated should yield
            the Bessel J function:
          </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">v