fer, relevant only if <CODE>Mode</CODE> is a refinement of <A HREF="../guide/modes.html#input"><CODE>input</CODE></TD>
    </TR>
</TABLE>

<P>
    This chain will become <I>complete</I> upon the return of this function, and can then be used to perform i/o.
</P>

<A NAME="pop"></A>
<H4><CODE>chain::pop</CODE></H4>
<PRE CLASS="broken_ie">    <SPAN CLASS="keyword">void</SPAN> pop();</PRE>

<P>Removes the final Filter or Device from this chain, which must be non-empty. If this chain is  <A HREF="#is_complete">c