TRefArrays and MakeProxy with modified Event.cxx

ROOT
1

Hi ,

I modified the example $ROOTSYS/test/Event.cxx/.h by adding a new class called “DTag” which is essentially a reconstructed D meson. That works and I produce my DTag objects.

The problem I have is when I try to add a TRefArray* fDauTrack, which is intended to be a list of pointers to the daughter tracks in the Track list. The .cxx and .h files are attached, and I use the MainEvent.cxx program inthe sample to generate the tree.

The Tree gets built without complaint and I can run MakeProxy without complaint, but when I try looping with the Process command, I get a message which I do not understand. If I comment out any lines to do with fDauTrack, it works fine, but when I add this bach in(as is attached below) I get the following error:

root [0] TFile* f = new TFile(“Event.root”, “READ”);
Warning in TClass::TClass: no dictionary for class Event is available
Warning in TClass::TClass: no dictionary for class EventHeader is available
Warning in TClass::TClass: no dictionary for class Track is available
Warning in TClass::TClass: no dictionary for class DTag is available
root [1] TTree* mytree = (TTree*)(f->Get(“T”));
root [2] mytree->MakeProxy(“MyEventAnalysis”, “DVVAnalysis.C”);
root [3] mytree->Process(“MyEventAnalysis.h+”);
Info in TUnixSystem::ACLiC: creating shared library /home/smith/DTagVV/./MyEventAnalysis_h.so
Error: abstract class object ‘TCollection default_val’ declared FILE:/usr/local/root/include/TBranchProxyTemplate.h LINE:124
Error: abstract class object ‘TSeqCollection default_val’ declared FILE:/usr/local/root/include/TBranchProxyTemplate.h LINE:124
Warning: Error occured during reading source files
Warning: Error occured during dictionary source generation
!!!Removing /home/smith/DTagVV/./fileeZl5sM.cxx /home/smith/DTagVV/./fileeZl5sM.h !!!
Error: rootcint: error loading headers…
Error in : Dictionary generation failed!
Info in : Invoking compiler to check macro’s validity
g++: compilation of header file requested
Error in TSelector::GetSelector: file MyEventAnalysis.h+ does not have a valid class deriving from TSelector
(long long)-1
Event.cxx (12.4 KB)
Event.h (8.16 KB)

2

unfortunately MakeProxy does not yet support TRefArray or any STL collection. This should be fixed in the next few months.

Philippe.

3

It doesn’t seem to complain about the fMuon and fHighPt ones that come with the Event.cxx example, only the ones I add.

Does MakeClass support them?

Is there an example of how to reference them to get to the object they point to using the output of MakeClass?

Thanks,
Alex

4

[quote]It doesn’t seem to complain about the fMuon and fHighPt ones that come with the Event.cxx example, only the ones I add.[/quote]The difference is that your TRefArray are nested inside a TClonesArray while the others are not. What is actually not implemented is TCollections (include TRefArray) inside a TClonesArray.
MakeClass would not support it either but might be ignoring it better.
Philippe.