Hi Stefano, thanks for replying and the education about virtual destructors. I did not most of that, but not the bit that the virtual base destructor gets called as well. However its the pure part that got me confused. First I got the problem about the strange unresolved symbol __dt__1AXv. I know about nm with demangling - what I had not realised was that, by default nm demangles on OSF - I had to ask to mangle the name to find other examples of __dt__*Xv. So thanks for that. I still would like to know why adding inheritance from TObject convinced CINT that the concrete subclass was now incomplete. Cheers, Nick.
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