TTree::UnsetNotify

ROOT
1

I’ve noticed the TTree::SetNotify method is undocumented. Is there any way to unset a notify statement? I have a number of objects that will be deleted and I want to avoid segmentation violations.

Thanks.

2 
SetNotify(nullptr);

Cheers,
Philippe.

3

Ahh, so you can only notify one object?

This won’t work so well for my application.

4

Yes, you can directly only notify one object. However you can have this ‘one’ object being a collector object that turns around and notify a list.

5

Working on that now. Thanks for the info. It’s a bit of a bummer one had to create this class.

6

See for example the TTreeFormulaGroup proposed in TTreeFormula and TChain

7

I was able to produce a more compact class using a vector as a base class. After doing this it occurred to me that a TObjArray should have this Notify functionality.

#ifndef TOBJECTNOTIFYGROUP_HPP
#define TOBJECTNOTIFYGROUP_HPP

#include <vector>

#include <TObject.h>

class TObjectNotifyGroup : public std::vector< TObject* >, public TObject {
   public:
         TObjectNotifyGroup() : TObject() {};
         virtual ~TObjectNotifyGroup() {};

         virtual Bool_t Notify() {
            Bool_t success = true;
            for (auto obj : *this) success &= obj->Notify();
            return success;
         };
};

#endif // TOBJECTNOTIFYGROUP_HPP
8

I was able to produce a more compact class using a vector as a base class. After doing this it occurred to me that a TObjArray should have this Notify functionality.

This is a good simple idea. I added the function to all ROOT collections. See http://root.cern.ch/gitweb?p=root.git;a=commitdiff;h=5a918e25f8c5df4e51ad837e66d8fd23133dec38 in time for v6.10.

Thanks,
Philippe.