<TBranchElement::GetDataMemberOffset>: obsolete call

ROOT
1 
namespace trk{                                                                                                                             
class Header : public TObject{ ... };                                                                                                                             
class Event : public TObject{
 private:
  Header _head;
  Int_t  _nClusters;
  ...
};                                                                                                                             
}

namespace tof{                                                                       
class Header : public TObject{ ... };
class Event : public TObject{
 private:
  Header _head;
  Int_t  _nBars;
  ...
};
}

namespace glb{
class Event : public TObject{
private:
  trk::Event _trkev;
  tof::Event _tofev;
  ...
};                                                                                                                             
}

I can write a ROOT file with this structure.
But when I read this file I have this error:

Error in TBranchElement::GetDataMemberOffset: obsolete call with (trk::Event,_trkev._head)
Error in TBranchElement::GetDataMemberOffset: obsolete call with (trk::Event,._head)
Error in TBranchElement::GetDataMemberOffset: obsolete call with (trk::Event,._head)
Error in TBranchElement::GetDataMemberOffset: obsolete call with (tof::Event,_tofev._head)
Error in TBranchElement::GetDataMemberOffset: obsolete call with (tof::Event,._head)
Error in TBranchElement::GetDataMemberOffset: obsolete call with (tof::Event,._head)

Thank you for your help.
Alberto

2

Hi,

Could you send me a running example so that I can understand the problem and maybe fix it :slight_smile:

Cheers,
Philippe.

3

Did you received my e-mail?

4

First I compile the files attached with a linkdef.h like this:

[code]#ifdef CINT
#pragma link off all globals;
#pragma link off all classes;
#pragma link off all functions;

#pragma link C++ nestedclass;
#pragma link C++ nestedtypedef;

#pragma link C++ namespace tof;
#pragma link C++ namespace trk;
#pragma link C++ namespace glb;

#pragma link C++ class tof::Header+;
#pragma link C++ class tof::Event+;
#pragma link C++ class trk::Header+;
#pragma link C++ class trk::Event+;
#pragma link C++ class glb::Event+;

#pragma link C++ class tof;
#pragma link C++ class trk;
#pragma link C++ class glb;
#endif [/code]

after in ROOT 4.03 I do:

.L micro.cxx TFile f("micro.root") TTree* mytree = (TTree*) f->Get("mytree") glb::Event* event = new glb::Event() mytree->SetBranchAddress("mybranch",&event)

then the problem occurs.
micro.h (1.72 KB)
micro.cxx (1.01 KB)
main.cxx (834 Bytes)

5

Hi,

The problem comes from the fact that you are trying to read data using the interpreted version of your classes.
Instead of.L micro.cxx you should load a library defining your classes.

And indeed, we should improve the situation so that it would work in this case anyway or at the very least issue a proper warning message.

Cheers,
Philippe.

PS. For example I used loader.C

#include "micro.h" #include "linkdef.h" #include "micro.cxx" and

6

Thank you very much,
I have tried to do a shared library with the C++ linker,
but doesn’t work. But in this way the problem is solved,
thank you for the help,
and for your precious time.

Best regards,
Alberto :smiley: