Greetings, I have a few basic questions about the RTTI facility and I/O via the TTree class. They are: 1) If you have a collection of objects that is too large to keep in memory is the TTree the only/best collection class to use? 2) Can you change the size of an object in the TTree (by adding a new member into a container within the object) without re-building the tree? 3) Can you insert a new object into the middle of a TTree without re-building the tree? 4) I want to use a TMap to associate a TString to a class type and then create new objects of a particular type based on a given TString? I've looked at the RTTI facility but am unclear on exactly how this would work. Thanks, Jim White -- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Jim White 505-667-0398 Los Alamos National Laboratory (FAX) 505-665-5220 MS B-265 Los Alamos, NM 87545 jmw@lanl.gov http://www.c3.lanl.gov/~jmw/info.shtml ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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