An instance of this class represents a user-written callback in an application that uses an instance of Cplex to solve a problem by means of the (primal or dual) simplex optimizer. For more information on the simplex optimizers, see the CPLEX User's Manual.

Cplex calls the user-written callback at the end of each simplex iteration.

The constructor and methods of this class are protected to make sure that they are used only to derive a user-written callback class or to implement the main method in it.