How to loop over TFile with BRanches etc

loopTest.cpp

#include <iostream>
#include <TChain.h>
#include "TFile.h"
#include "TDirectoryFile.h"
#include "TTree.h"
#include "DeltaR_Matcher.h"


int main() {
    std::cout << "Looping test" << std::endl;

    // Do conversions better!
    TFile * inFile = TFile::Open("test/L1Tree.root");
    TDirectoryFile * tdf = (TDirectoryFile*) inFile->Get("l1ExtraTreeProducer");
    TTree * tree = (TTree*) tdf->Get("L1ExtraTree");
    tree->SetMakeClass(1); // MAGIC FUNCTION MAKES THIS ALL WORK SOMEHOW
    tree->Print();
    // tree->MakeCode("treeCode.C");
    // tree->MakeClass("treeCode");

    TLorentzVector * l = new TLorentzVector();

    TBranch * b_L1Extra_cenJetEt = tree->GetBranch("cenJetEt");
    TBranch * b_L1Extra_cenJetEta = tree->GetBranch("cenJetEta");
    TBranch * b_L1Extra_cenJetPhi = tree->GetBranch("cenJetPhi");

    std::vector<double>  cenJetEt;
    std::vector<double>  cenJetEta;
    std::vector<double>  cenJetPhi;

    tree->SetBranchAddress("cenJetEt", &cenJetEt, &b_L1Extra_cenJetEt);
    tree->SetBranchAddress("cenJetEta", &cenJetEta, &b_L1Extra_cenJetEta);
    tree->SetBranchAddress("cenJetPhi", &cenJetPhi, &b_L1Extra_cenJetPhi);

    std::vector<TLorentzVector*> vecs;

    Long64_t nentries = tree->GetEntriesFast();
    std::cout << nentries << std::endl;
    for (Long64_t jentry = 0; jentry < nentries; jentry++) {
        vecs.clear(); // dodgy as hell cos it doens't delete the pointed to memeory only the pointer itself
        tree->GetEntry(jentry);
        std::cout << cenJetEt.size() << std::endl;
        for (uint i = 0; i < cenJetEt.size(); ++i){
            l = new TLorentzVector();
            l->SetPtEtaPhiM(cenJetEt[i], cenJetEta[i], cenJetPhi[i], 0);
            vecs.push_back(l);
            vecs[i]->Print();
        }
        // std::cout << vecs.size() << std::endl;
        // std::cout << vecs[0]->Pt() << std::endl;
        // std::cout << cenJetEt[0] << std::endl;

    }

    // DeltaR_Matcher * m = new DeltaR_Matcher(0.5);
    // m->printName();
    // m->setRefJets(refJets);
    // m->setL1Jets(l1Jets);
    // m->setMinRefJetPt(10);
    // m->setMinL1JetPt(0);
    // m->setMaxJetEta(5.0);

    // std::vector<std::pair<TLorentzVector, TLorentzVector>> results = m->produceMatchingPairs();
    // for (auto &it: results)
    // {
    //     std::cout << "refjet: " ;
    //     it.first.Print() ;
    //     std::cout << " l1jet: " ;
    //     it.second.Print();
    //     std::cout << std::endl;
    // }


}