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Class IloCplex::CutCallbackI

Definition file: ilcplex/ilocplexi.h
Note

This is an advanced class. Advanced classes typically demand a profound understanding of the algorithms used by ILOG CPLEX. Thus they incur a higher risk of incorrect behavior in your application, behavior that can be difficult to debug. Therefore, ILOG encourages you to consider carefully whether you can accomplish the same task by means of other classes instead.

An instance of the class IloCplex::CutCallbackI represents a user-written callback in an application that uses an instance of IloCplex to solve a mixed integer programming problem (a MIP). This class offers a method to add a local or global cut to the current node LP subproblem from a user-written callback. More than one cut can be added in this callback by calling the method add or addLocal multiple times. All added cuts must be linear.

The constructor and 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.

See Also:

IloCplex, IloCplex::Callback, IloCplex::CallbackI, IloCplex::MIPCallbackI, IloCplex::ControlCallbackI, IloCplex::OptimizationCallbackI, ILOCUTCALLBACK0

Constructor Summary
protected CutCallbackI(IloEnv env)
Method Summary
protected IloConstraintadd(IloConstraint con)
protected IloConstraintaddLocal(IloConstraint con)
Inherited Methods from ControlCallbackI
getDownPseudoCost, getDownPseudoCost, getFeasibilities, getFeasibilities, getFeasibility, getFeasibility, getFeasibility, getFeasibility, getLB, getLB, getLBs, getLBs, getNodeData, getObjValue, getSlack, getSlacks, getUB, getUB, getUBs, getUBs, getUpPseudoCost, getUpPseudoCost, getValue, getValue, getValue, getValues, getValues, isSOSFeasible, isSOSFeasible
Inherited Methods from MIPCallbackI
getNcliques, getNcovers, getNdisjunctiveCuts, getNflowCovers, getNflowPaths, getNfractionalCuts, getNGUBcovers, getNimpliedBounds, getNMIRs, getObjCoef, getObjCoef, getObjCoefs, getObjCoefs, getUserThreads
Inherited Methods from MIPInfoCallbackI
getBestObjValue, getCutoff, getDirection, getDirection, getIncumbentObjValue, getIncumbentSlack, getIncumbentSlacks, getIncumbentValue, getIncumbentValue, getIncumbentValues, getIncumbentValues, getMyThreadNum, getNiterations, getNnodes, getNremainingNodes, getPriority, getPriority, hasIncumbent
Inherited Methods from OptimizationCallbackI
getModel, getNcols, getNQCs, getNrows
Inherited Methods from CallbackI
abort, duplicateCallback, getEnv, main
Constructor Detail

CutCallbackI

protected CutCallbackI(IloEnv env)

This constructor creates a callback for use in an application with a user-defined cut to solve a MIP.

Method Detail

add

protected IloConstraint add(IloConstraint con)

This method adds a cut to the current node LP subproblem for the constraint specified by con. This cut must be globally valid; it will not be removed by backtracking or any other means during the search. The added cut must be linear.

addLocal

protected IloConstraint addLocal(IloConstraint con)

This method adds a local cut to the current node LP subproblem for the constraint specified by con. IloCplex will manage the local cut in such a way that it will be active only when processing nodes of this subtree. The added cut must be linear.