ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::MIPCallbackI
IloCplex::NodeCallbackI, IloCplex::ProbingCallbackI,
IloCplex::SolveCallbackI, ILOMIPCALLBACK0
Constructors
Methods
protected MIPCallbackI()
This constructor creates a callback for use in an application that uses an instance of
IloCplex to solve a mixed integer program (MIP).
protected IloNum getBestObjValue()
This method returns the currently best known bound on the optimal solution value of the
problem at the time the invoking callback is called by an instance of IloCplex while
solving a MIP. When a model has been solved to optimality, this value matches the
optimal solution value. Otherwise, this value is computed for a minimization
(maximization) problem as the minimum (maximum) objective function value of all
remaining unexplored nodes.
protected IloNum getCutoff()
Returns the current cutoff value.
An instance of IloCplex uses the cutoff value (the value of the objective function of
the subproblem at a node in the search tree) to decide when to prune nodes from the
search tree (that is, when to cut off that node and discard the nodes beyond it). The
cutoff value is updated whenever a new incumbent is found.
protected IloCplex::BranchDirection getDirection(const IloIntVar var)
Returns the IloCplex::BranchDirection used for variable var in the current
optimization.
protected IloCplex::BranchDirection getDirection(const IloNumVar var)
Returns the IloCplex::BranchDirection used for variable var in the current
optimization.
protected IloNum getIncumbentObjValue()
Returns the value of the objective function of the incumbent solution (that is, the best
integer solution found so far) at the time the invoking callback is called by an instance of
IloCplex while solving a MIP. If there is no incumbent, this method throws an
exception.
protected IloNum getIncumbentValue(const IloIntVar var)
Returns the solution value of var in the incumbent solution at the time the invoking
callback is called by an instance of IloCplex while solving a MIP. If there is no
incumbent, this method throws an exception.
protected IloNum getIncumbentValue(const IloNumVar var)
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 176