#include "DataFormats/Candidate/interface/OverlapChecker.h"
#include "DataFormats/Candidate/interface/Candidate.h"
using namespace reco;

bool OverlapChecker::operator()(const Candidate& c1, const Candidate& c2) const {
  typedef Candidate::const_iterator iterator;
  if (c1.numberOfDaughters() == 0) {
    if (c2.numberOfDaughters() == 0) {
      if (c2.hasMasterClone())
        return c1.overlap(*(c2.masterClone()));
      else
        return c1.overlap(c2);
    }
    iterator b2 = c2.begin(), e2 = c2.end();
    for (iterator i2 = b2; i2 != e2; ++i2) {
      if (operator()(c1, *i2)) {
        return true;
      }
    }
    return false;
  }
  iterator b1 = c1.begin(), e1 = c1.end();
  for (iterator i1 = b1; i1 != e1; ++i1) {
    if (operator()(*i1, c2)) {
      return true;
    }
  }
  return false;
}