Dear Mr. Brun,
thak you for your immediate answer!
As far as I understand if I want to be sure to save something in a TTree,
I must create a class that inherits from TObject and contains my personal
stuff.
Now I am trying to implement a solution following this path; however, I
also tried to save my data, instead in a stl::vector, in a simple C-like
array, following the structure of tree2.C.
Again, I got a strange behaviour; I don't have any precise clue on where
the problem could be, but the fact that I am using arrays, since if I try
to save a (simple) class in a TTree I can read it afterward, without any
problem, provided that it doesn't contain any array.
In attachment you can find the code (temperature2.cpp) with the array and
the one that seems to work (prova.cpp).
Thanks again
pietro
On Wed, 5 Mar 2003, Rene Brun wrote:
>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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