e pback_size = <SPAN CLASS="omitted">default_value</SPAN> );

        <SPAN CLASS="comment">// Forwarding overloads of open()</SPAN>

    <SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> U&gt;
    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#stream_forwarding_open">open</A>([<SPAN CLASS="keyword">const</SPAN>] U&amp; u);

    <SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> U1, <SPAN CLASS="keyword">typename</SPAN> U2&gt;
    <SPA