This function creates and returns a constraint that abstracts an array of constrained Boolean variables in a model. It differs from IloAbstraction in that its y-array is an array of Boolean variables (also known as 0-1 variables or binary variables). Like IloAbstraction, for each element x[i], there is a variable y[i] corresponding to the abstraction of x[i] with respect to an array of values. That is,

 x[i] = v with v in values if and only if y[i] = IloTrue;

 x[i] = v with v not in values if and only if y[i] = IloFalse.
 

This constraint maintains a many-to-one mapping that makes it possible to define constraints that impinge only on a particular set of values from the domains of constrained variables.

Example

For simplicity, assume that an array x consists of three elements with the domains {3}, {4}, and {5}. Assume that the values we are interested in are {4, 8, 12, 16}. Then IloBoolAbstraction produces the elements of the array y, like this:

                  X      &         Values               Y
                 ---               -------           -------
                  3                   4              IloFalse
                  4                   8    -->       IloTrue
                  5                  12              IloFalse
                                     16
 

Adding a Constraint to a Model, Extracting a Model for an Algorithm

In order for the constraint returned by IloBoolAbstraction 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.

Exceptions

If the arrays x and y are not the same size, this function throws the exception IloBoolAbstraction::InvalidArraysException.

Note: This constraint cannot be used in a logical constraint.