This function creates and returns a constraint (an instance of IloConstraint) for use in a model. The constraint forces the set var1 to have no elements in common with the set var2. In other words, the intersection of var1 with var2 will be empty when this constraint is satisfied.

In order for the constraint to take effect, you must add it to a model with the template IloAdd or the member function IloModel::add and extract the model for an algorithm with the member function IloAlgorithm::extract.