"keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">Tr</A>    = std::char_traits&lt;Ch&gt;, 
          <SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">Alloc</A> = std::allocator&lt;<CODE>Ch</CODE>&gt; &gt;
<SPAN CLASS="keyword">class</SPAN> <A CLASS="documented" HREF="chain.html">chain</A> : <SPAN CLASS="keyword">public</SPAN> <SPAN CLASS="omitted">implementation-defined stream type</SPAN> {
<SPAN CLASS="keyword">public</SPAN>:
    <SPAN CLASS="keyword