Hi, I wrote to this mailing list a month or so ago about removing TObjects from a file. It was suggested that I do the following: // obj is preexisting and derived from TObject gDirectory->GetList()->Remove(obj); This does indeed remove the objects, so that when I close the file, they are not deleted. However, there is an addtional snag. If my object derives from TH1, then when ~TH1() is eventually called, it looks at TH1::fDirectory. If fDirectory != 0 , it tries to remove the object from its directory, (which doesn't exist). I know how to remove a histogram from a directory via TH1::SetDirectory(), but TH1 seems to be a very special case (along with TTree maybe?) where this is step is needed. Is there any way around this, besides lots of IsA == TXXX::Class() statements? If not, are there other classes that have similar caveats? mike kordosky
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