Stephen Levy
levys@hep.uchicago.edu
April 10, 2006
#----------------------

This code snippet assumes that you have a pointer to an uber object
that has been correctly initialized in the event.  The following files
must be included

#include <map>
#include <set>

Declare the following std::map before looping over events:

  std::map < int, std::set<int> > evtmap;

And then in the loop over the events add:

    // --- check for duplicate events in data
    int run = uber->header.run;
    int event = uber->header.event;
    bool unique = (evtmap[run].insert(event)).second;
    if (!unique) {
      std::cout << "ERROR: duplicate event for run/event " << run << "/" << event << std::endl;
      continue;
    }

which will print out an error warning and skip over the duplicate events.