[ROOT] problem in streaming TClonesArray in 3.03/9

From: Wouter Hulsbergen (hulsberg@SLAC.stanford.edu)
Date: Wed Nov 20 2002 - 02:06:02 MET 

Dear developers,

I have an event class which contains a TClonesArray of objects of type B,
derived from type A. Type B also contains an object of type A:

class A : public TObject
{
}

class B : public A
{
private:
  A _anA ;
}

class Event
{
private:
  TClonesArray* theAs ;
  TClonesArray* theBs ;
}

Processing the tree with tree->GetEvent(i) in a macro in interactive root,
I found something strange:  The TClonesArray `theAs' and `theBs' are
properly filled, except for one thing: The branches containing the
elements `B::_anA' are all empty (zero).

If I use the TBrowser to browse through the elements `B::_anA', they are
not zero, but instead take the values that are given to the corresponding
elements in B itself (derived from A). So something is really mixed
up.

I am sure that the elements are properly set before the ClonesArray is
streamed. However, I cannot check that the TClonesArray is properly
written to file, since I do not know how to implement a private Streamer
in 3.03/09: The Streamer that I have written is not called.

What could be wrong?

Thanks and best regards,
Wouter

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