> With the way boost::result_of is implemented, I couldn't find a way
to<br />&gt; make an approach like the above work.  The best I could do
was the <br />&gt; result_of_defined code.<br /><br />So we're stuck with
the implementation I gave earlier but with a rather weak semantic as some
type can give false positive ... For me it's enough anyway as most of the
time the problem lies in a missing result struct. <br /><br />So anyway,
what can we do to access this ?