#include <iostream>

#include <TClonesArray.h>
#include <TTree.h>

class CNumber : public TObject {
private:
    Int_t nr;

public:
    CNumber () {
        nr = 0;
    }

    CNumber (Int_t _nr) {
        nr = _nr;
    }

    virtual ~CNumber() {
    }

    Int_t GetNumber() {
        return nr;
    }

    virtual void Print (Option_t* option="") const {
        std::cout << nr << std::endl;
    }

    ClassDef(CNumber, 1);
};

void TClonesArrayError() {
    TTree *tree = new TTree("tree", "MyTree");
    TClonesArray *data = new TClonesArray("CNumber");
    tree->Branch("data", &data);

    new (data->operator[](0)) CNumber(2);
    new (data->operator[](1)) CNumber(3);
    data->Print();
    tree->Fill();
    std::cout << "Number entries in array: " << data->GetEntries() << std::endl;

    std::cout << "Removing the first entry in array." << std::endl;
    data->Remove(data->operator[](0));
    data->Print();
    std::cout << "Number entries in array: " << data->GetEntries() << std::endl;
    std::cout << "Filling the tree will now crash ..." << std::endl;
    tree->Fill();
}