ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::ContinuousCallbackI
Description
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
Constructors
Methods
IloCplex, IloCplex::Callback, IloCplex::CallbackI,
ILOCONTINUOUSCALLBACK0
protected ContinuousCallbackI()
This constructor creates a callback for use in an application that solves continuous
models.
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.
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.
protected IloInt getNiterations()
This method returns the number of iterations completed so far by an instance of
IloCplex at the invoking callback is executed.
protected IloNum getObjValue()
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 104