yword'>typename</SPAN> T&gt;
    T* component(<SPAN CLASS="keyword">int</SPAN> n) <SPAN CLASS='keyword'>const</SPAN>;
</PRE>

<P>
      Returns a pointer to the <CODE>n</CODE><I>th</I> Filter or Device in this chain, if this chain has size at least <CODE>n + 1</CODE> and the type of the <CODE>n</CODE><I>th</I> Filter or Device is equal to <CODE>T</CODE>. Otherwise, returns a null pointer. The template argument <CODE>T</CODE> cannot be deduced, and must therefore be explicitly specified.
</P>
<P>
      Users