Hi Pietro,
STL collections are not accepted as top level branches. They must be included
inside a class. Currently top level branches can only be
- basic types
- TObject*
- TCollection
- folders
We are now in the process of including native support for STL collections
in the ROOT dictionary. Like we do now with TClonesArray, STL vector and
list vector<myclass>, vector <myclass*>, etc will be supported by
the Tree split mechanism. We are testing this code now and hope to include it in
a few weeks in the standard version. The coming release 3.05/03 will not include
it.
Rene Brun
Pietro Govoni wrote:
>
> Dear Roottalk,
> is there anbody who created a TTree containing an STL container?
> I am trying to store a simple vector<double>, following an example that I
> found among the tutorials.
> When I try to put in a TTree that vector I get a lot of different errors,
> depending on strange parameters, e.g. whether I put or not a line like:
>
> cout << "---------------------------------------" << endl;
>
> in the code.
> There should be something fundamental that I'm forgetting, does anybody
> know what should I do?
>
> Thanks in advance
>
> pietro
>
> PS follows my little code:
>
> #include "TFile.h"
> #include "TTree.h"
> #include <vector>
>
> //
> // to run the example, do:
> // .x temperature.cpp to execute with the CINT interpreter
> //
>
> void temperature_w()
> {
> TFile f("treeTemperature.root","recreate"); // create the file
> TTree tempo("tempo","tentativo"); // create a new tree
> vector <double> Temperature; // create a vector
> for (int i=0; i< 40; ++i) Temperature.push_back(0.); // initialize
> it
>
> cout << Temperature.size() << endl;
>
> tempo.Branch("Temperature",&Temperature,"temperatura 40 sonde (V)");
>
> for (int i=0; i<3; ++i)
> {
> int j = 0;
> for (vector<double>::iterator it = Temperature.begin();
> it != Temperature.end();
> ++it)
> {
> *it = 10 * i + (++j);
> cout << *it << '\t';
> }
> cout << Temperature.size() << endl;
> tempo.Fill();
> }
> f.Write();
> }
>
> void temperature_r()
> {
> TFile f("treeTemperature.root");
> TTree *tempo = (TTree*)f->Get("tempo"); // si puo' fare in altro
> modo??
> tempo->Print();
>
> vector <double> Temperature;
> for (int i=0; i< 40; ++i) Temperature.push_back(0.); // (1)
> cout << "ole " << Temperature.size() << endl; // (2)
> TBranch *b_Temperature = tempo->GetBranch("Temperature");
> b_Temperature->SetAddress(&Temperature);
>
> Int_t nentries = (Int_t)tempo->GetEntries();
> cout << nentries << endl;
>
> for (Int_t i=0; i<nentries; ++i)
> {
> b_Temperature->GetEntry(i);
> cout << Temperature.size() << endl;
> /*
> for (vector<double>::iterator it = Temperature.begin();
> it != Temperature.end();
> ++it)
> {
> cout << *it << '\t';
> }
> */
> cout << endl;
> }
>
> delete tempo;
> }
>
> void temperature()
> {
> temperature_w();
> temperature_r();
> }
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