Hi Vuko, To delete all histograms/trees from memory (current directory only), do: gDirectory->GetList()->Delete(); Rene Brun Vuko Brigljevic wrote: > > Hi Rene, > > I have a somewhat related question: I'd like to delete > all histograms IN MEMORY in the working directory. Do I > achieve that with: > > delete gDirectory()->GetList(); > > or am I causing some collateral damage??? > > Note that I do NOT want to delete histograms > and ntuples that are written on the file. > > Rene Brun wrote: > > > > Hi Simon, > > > > In general, Use the form > > delete inheritedclass; > > > > If your class is a ROOT collection, like TList, TObjArray, you can do: > > mycollection->Delete(); //to delete all objects in the collection; > > delete mycollection; // to delete the empty collection. > > > > Note that if the collection has been declared to be the owner with > > mycollection->SetOwner(); > > it is sufficient to do: > > delete mycollection; //all owned objects will be automatically deleted. > > > > See also the chapter on Object Ownership in the Users Guide. > > > > Rene Brun > > > > Simon Dean wrote: > > > > > > Hi there, > > > > > > Could someone please explain to me the subtle nuances of destructors in > > > classes which inherit from TObject? I'm having problems with crashes > > > caused by such destructors, although I think the problem may be due to > > > delete statements inside them which refer to other classes that inherit > > > from TObject. > > > > > > What is TObject->Delete() and what is it used for? Would I do: > > > > > > delete inheritedclass > > > or > > > inheritedclass->Delete() > > > > > > for cleaning up memory. > > > > > > cheers, > > > > > > Simon > > -- > > ======================================================================== > Vuko Brigljevic | Mail : SLAC, Mail Stop 41 > Lawrence Livermore National Laboratory | P.O. Box 4349, Stanford > Nuclear and Particle Physics Division | CA 94309, USA > | SLAC-Office : B280- room 143 > Member of the BaBar Collaboration | Phone : +1-650-926 8512 > <vuko@slac.stanford.edu> <http://www.slac.stanford.edu/~vuko> > ========================================================================
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