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Class IloCplex::ContinuousCallbackI

Definition file: ilocplexi.h
Include files: ilcplex/ilocplex.h

An instance of a class derived from IloCplex::ContinuousCallbackI represents a user-written callback in an ILOG CPLEX application that uses an instance of IloCplex with the primal simplex, dual simplex, or barrier optimizer. IloCplex calls the user-written callback after each iteration during an optimization of a problem solved at a node. This class offers methods for use within the callbacks you write. In particular, there are methods in this class to access primal and dual feasibility, number of iterations, and objective value.

The methods of this class are protected for use in deriving a user-written callback class and in implementing the main method there.

If an attempt is made to access information not available to an instance of this class, an exception is thrown.

Note

There are special callbacks for simplex and barrier, that is, IloCplex::SimplexCallbackI and IloCplex::BarrierCallbackI, respectively. Using a continous callback sets this callback in both of these algorithms. If a special callback was already set for one of these algorithms, (for example, simplex) it is replaced by the general continuous callback.

See Also:

IloCplex, IloCplex::Callback, IloCplex::CallbackI, ILOCONTINUOUSCALLBACK0

Constructor Summary
protected ContinuousCallbackI()
Method Summary
protected IloNumgetDualInfeasibility()
protected IloNumgetInfeasibility()
protected IloIntgetNiterations()
protected IloNumgetObjValue()
protected IloBoolisDualFeasible()
protected IloBoolisFeasible()
Inherited Methods from CallbackI
abort, duplicateCallback, getEnv, getModel, getNcols, getNQCs, getNrows, main
Constructor Detail

ContinuousCallbackI

protected ContinuousCallbackI()

This constructor creates a callback for use in an application that solves continuous models.

Method Detail

getDualInfeasibility

protected IloNum getDualInfeasibility()

This method returns the current dual infeasibility measure of the solution in the instance of IloCplex at the time the invoking callback is executed.

getInfeasibility

protected IloNum getInfeasibility()

This method returns the current primal infeasibility measure of the solution in the instance of IloCplex at the time the invoking callback is executed.

getNiterations

protected IloInt getNiterations()

This method returns the number of iterations completed so far by an instance of IloCplex at the invoking callback is executed.

getObjValue

protected IloNum getObjValue()

This method returns the current objective value of the solution in the instance of IloCplex at the time the invoking callback is executed.

isDualFeasible

protected IloBool isDualFeasible()

This method returns IloTrue if the current solution is dual feasible.

isFeasible

protected IloBool isFeasible()

This method returns IloTrue if the current solution is primal feasible.