Save object with STL data member to ROOT file

ROOT
1

Hi,

I have a problem saving STL data members to a ROOT file. They are data members of a class that is saved allright to the ROOT file using

TBranch *b_evt = fOutputTree->Branch("Event", "SEvent", &fEvent, 32000, 99); When I open the ROOT file I can though only see the data members of primitive types (integers, floats,…) and of type TObject/TObjectArray and so on. I initialise the STL data members the same way as the ROOT types (see below).

From the following example, only fObject can be seen in the Object in the output file:

[code]class SEvent : public TObject {
private:
std::vector* fNHits_A;
std::vector fNVector;
std::string fString;
TObject fObject;
…
}

SEvent::SEvent() : TObject() {
fNHits_A = new vector;
fNVector = vector();
fString = string();
fObject = TObject();
…
}[/code]
Using the object in the code before saving does not seem to cause any problems. The compiler does also accept it without any problem. The non-saved data members are also present in the SEventDict.cxx file. Any hint what could cause the problem?

Cheers,

Jan.

2

Hi,

How do you look at the values of the data members of the read object? With a TBrowser? Or with code?

Cheers, Axel.

3

[quote=“Axel”]Hi,

How do you look at the values of the data members of the read object? With a TBrowser? Or with code?

Cheers, Axel.[/quote]
Hi Axel,

I looked with a TBrowser and using CINT on the console. Both wouldn’t access the containers.

Cheers,

Jan.

4

HI Jan,

This should work fine (as long as you compile the class and provide a dictionary for it). Could you provide a complete running example showing the failure?

Thanks,
Philippe.

5

[quote=“pcanal”]HI Jan,

This should work fine (as long as you compile the class and provide a dictionary for it). Could you provide a complete running example showing the failure?

Thanks,
Philippe.[/quote]
Hi Philippe,

ok, I’ll try to figure out a working example. I put together a minimal example as a check using the User’s guide and it worked fine. I’ll look if I can reproduce it on a small scale somehow.

Cheers,

Jan.