Hi Peeps
<div><br></div><div>Can anyone cast any light on this...</div><div><br></div><div>I want to write function which accepts a single pass range of X&#39;s, so something like this</div><div><br></div><div><font face="&#39;courier new&#39;, monospace">struct X { };</font></div>

<div><font face="&#39;courier new&#39;, monospace"><br></font></div><div><font face="&#39;courier new&#39;, monospace">template &lt;typename T&gt;</font></div><div><font face="&#39;courier new&#39;, monospace">    BOOST_CONCEPT_REQUIRES(</font></div>

<div><font face="&#39;courier new&#39;, monospace">        (( boost::SinglePassRangeConcept&lt;T&gt; )),</font></div><div><font face="&#39;courier new&#39;, monospace">        ( typename boost::enable_if&lt;boost::is_same&lt;typename boost::range_value&lt;T&gt;::type, X&gt;, void&gt;::type ))</font></div>

<div><font face="&#39;courier new&#39;, monospace">    my_function( const T &amp; range );</font></div><div><br></div><div>Is that a reasonable construction, or is there a better way to say it?</div><div><br></div><div>Next, it doesn&#39;t seem to work. It does seem to work if the type to which enable_if resolves is anything</div>

<div>except void, but not for void. Why is this?</div><div><br></div><div>TIA</div><div><br></div><div>- Rob.</div>