This aggregator maintains information about the reduction rate of the domains of variables. It is required to use the functions:

 IloInt IloSolver::getReduction(const IlcIntVar x) const;
 IloInt IloSolver::getReduction(const IloIntVar x) const;
 IloNum IloSolver::getReduction(const IlcFloatVar x) const;
 IloNum IloSolver::getReduction(const IloNumVar x) const;