This function creates an IBM® ILOG® Concert Technology constraint from a propagator. You can then add this constraint to a model (instance of IloModel). For example, using the propagator defined in the IloPropagatorI documentation:

       IloPropagatorI * prop = new (env) SignI(x, sgn);
       IloConstraint signCt = IloCustomConstraint(env, prop);
       model.add(signCt);