stance of the Device <CODE>T</CODE>. Before the instance can be used for i/o, one of its <CODE>open()</CODE> overloads must be invoked. 
</P>

<H4><CODE>stream::stream</CODE></H4>

<A NAME="stream_policy_constructor"></A>
<PRE>    <B>stream</B>( <SPAN CLASS="keyword">const</SPAN> T&amp; t,
            std::streamsize buffer_size, 
            std::streamsize pback_size );</PRE>
    
<P>
    Constructs a <CODE>stream</CODE> which is ready to perform i/o, where the parameters have the following interpretation