virtual Sequence print(ostream&, ostream&){ Sequence temp; return temp; }
virtual Sequence print(ostream&, ostream&, data_results, data_results) { Sequence temp; return temp; }
virtual int print(ostream&, ostream&, string){ return 0; }
+ virtual int getNumNoParents(){ return 0; }
virtual data_results getResults() { data_results results; return results; }
#ifdef USE_MPI