What ever happened to bool_testable or some other answer to the safe bool idiom?  I followed archived emails for a while, but thought it best to just bring up anew.  Is a general solution not possible?  How about a couple of solutions, where you pick the right one for your case?  Or a solution with variations that you pick (policy based)?
<br><br>Anything?<br><br>Thanks,<br>Tony<br>