This class is the handle class for all callback implementation classes available for IloCplex. Callback implementation classes are user-defined classes derived from a subclass of IloCplex::CallbackI.

This class serves two different purposes:

• It is the handle class for all the legacy callbacks. A legacy callback is implemented by inheriting from any of the descendants of this class and implementing the CallbackI::main() function.
• It provides a namespace for the more generic callback that is implemented by the user implementing the Function interface (more specifically, the method Function::invoke(Context)) and then CPLEX applying the Context passed into that function to perform queries and actions.

This constructor creates a callback handle object and initializes it to the implementation object passed as the argument.

This method deletes the implementation object pointed to by the invoking handle and sets the pointer to 0 (zero).

This method returns a pointer to the implementation object of the invoking handle.

This method returns the type of the callback implementation object referenced by the invoking handle.

This enumeration type is used to identify the type of a callback implementation object referred to by an IloCplex::Callback handle.

Interface for CPLEX callback.

Any class to be used as a CPLEX generic callback must implement this interface.

This method invokes the CPLEX generic callback. If an object is registered with CPLEX by means of the method IloCplex::use(Callback::Function, long), then CPLEX will invoke this function of the registered object in all contexts requested by the argument contextMask passed to IloCplex::use(Callback::Function, long).

Note that in this function you must not invoke any functions of the IloCplex that is performing the current solve. All functions that can be invoked from a callback are members of context.