Unable to use a class containing TLorentzVector...

From: John Zoidberg <zohn.joidberg_at_gmail.com>
Date: Sat, 1 Sep 2007 19:12:11 +0200

I created a class called lotsofdata containing arrays of ints and TLorentzvectors.
For some strange reason, whenever I try to initialize a variable with that class, the macro exits ROOT directly without any message.

Here is a simplified version of the problem:

#define MAXBGD 40000

#include <fstream>
#include <iostream>
#include "TLorentzVector.h"

using namespace std;

class lotsofdata
{

    public:

        TLorentzVector PlBg[MAXBGD];
        TLorentzVector MinBg[MAXBGD];
        int PlBg_PDG[MAXBGD];
        int MinBg_PDG[MAXBGD];
        int PlBg_mamaPDG[MAXBGD];
        int MinBg_mamaPDG[MAXBGD];

    public:
        lotsofdata(void);
        ~lotsofdata(void);
        int Save(char* filename); /**< save class as binary */
        int Load(char* filename); /**< load class from binary */

        //ClassDef(lotsofdata,1);  //special for ROOT

};

//ClassImp(lotsofdata); //special for ROOT

//constructor

lotsofdata::lotsofdata()
{}

//destructor

lotsofdata::~lotsofdata()
{}

//save class

int lotsofdata::Save(char* filename)
{

    cout<<"SAVING AS BINARY"<<endl;
    ofstream ofs(filename, ios::binary);     ofs.write((char *)this, sizeof(lotsofdata));     return(0);
}

//load class

int lotsofdata::Load(char* filename)
{

    cout<<"LOADING FROM BINARY"<<endl;
    ifstream ifs(filename, ios::binary);

    // if fstream cannot open file
    if ( !ifs )
    {

        cerr << "WARNING: File could not be opened." << endl;
        return(1);

    } // end if

    ifs.read((char *)this, sizeof(lotsofdata));     return(0);
}

void mystery(void)
{

    lotsofdata titi;
}

I compile it with .L mystery.C+ and then run mystery().

If the TLorentzVector lines are commented, I stay inside ROOT, if not, it exits without any message (even if I add cout or printf before initializing titi).

What's the problem with including TLorentzVectors in a class and how can I solve it? Received on Sat Sep 01 2007 - 19:12:30 CEST