PAN>&lt;<SPAN CLASS="keyword">typename</SPAN> U1, <SPAN CLASS="omitted">...</SPAN>, <SPAN CLASS="keyword">typename</SPAN> UN&gt;
    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#stream_buffer_forwarding_open">open</A>([<SPAN CLASS="keyword">const</SPAN>] U1& u1, <SPAN CLASS="keyword">const</SPAN> U2& u2, <SPAN CLASS="omitted">...</SPAN>, <SPAN CLASS="keyword">const</SPAN> UN& uN);

    <SPAN CLASS="keyword">bool</SPAN> <A CLASS="documented" HREF="#stream_buffer_is_open">is_open</A>() <SPAN