 CLASS="keyword">namespace</SPAN> boost { <SPAN CLASS="keyword">namespace</SPAN> iostreams {

<SPAN CLASS='keyword'>template</SPAN>&lt;<SPAN CLASS='keyword'>typename</SPAN> OutputFilter&gt;
<SPAN CLASS='keyword'>bool</SPAN> test_output_filter( OutputFilter filter, 
                         <SPAN CLASS='keyword'>const</SPAN> std::string&amp; input,
                         <SPAN CLASS='keyword'>const</SPAN> std::string&amp; output );

<SPAN CLASS='keyword'>template</SPAN>&lt;<SPAN CLASS='keyword'>typename</S