ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::PresolveCallbackI
model, the number of variables that have been aggregated, and the number of
coefficients that have changed as a result of presolve.
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
Constructors
Methods
IloCplex, IloCplex::Callback, IloCplex::CallbackI,
ILOPRESOLVECALLBACK0
protected PresolveCallbackI()
This constructor creates a callback for use in presolve.
protected IloInt getNaggregations()
This method returns the number of aggregations performed by presolve at the time the
callback is executeed.
protected IloInt getNmodifiedCoeffs()
This method returns the number of coefficients modified by presolve at the time the
callback is executeed.
protected IloInt getNremovedCols()
This method returns the number of columns removed by presolve at the time the
callback is executeed.
protected IloInt getNremovedRows()
This method returns the number of rows removed by presolve at the time the callback is
executeed.
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 204