AN CLASS="comment">// End namespace boost::io</SPAN></PRE>

<A NAME="template_params"></A>
<H4>Template parameters</H4>

<TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2>
<TR>
    <TR>
        <TD VALIGN="top"><I>Ch</I></TD><TD WIDTH="2em" VALIGN="top">-</TD>
        <TD>The <A HREF='../guide/traits.html#char_type'>character type</A></TD>
    </TR>
</TABLE>

<A NAME="do_filter"></A>
<H4><CODE>counter::do_filter</CODE></H4>

<PRE CLASS="broken_ie">    <SPAN CLASS='keyword'>virtual</SPAN> <SPAN CLASS='ke