E="margin-left:2em" BORDER=1 CELLPADDING=4>
    <TR><TH><CODE>category&lt;T&gt;::type</CODE></TH><TH>semantics</TH></TR>
    <TR>
        <TD VALIGN="top">convertible to <A HREF="../guide/modes.html#input"><CODE>input</CODE></A> but not to <A HREF="../guide/modes.html#output"><CODE>output</CODE></A></TD>
        <TD>calls <CODE>t.pop()</CODE> if <code>t</CODE> is complete and which == ios_base::in</CODE></TD>
    </TR>
    <TR>
        <TD VALIGN="top">otherwise</TD>
        <TD>calls <CODE>t.pop()</CODE> i