ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::GoalI
public IloNum getBestObjValue()
This method returns the currently best known bound on the optimal solution value of the
problem at the time the invoking goal is executed 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.
public IloNum getBranch(IloNumVarArray vars,
IloNumArray bounds,
IloCplex::BranchDirectionArray dirs,
IloInt i)
This method accesses branching information for the i-th branch that the invoking
instance of IloCplex is about to create. The parameter i must be between 0 (zero)
and getNbranches - 1; that is, it must be a valid index of a branch; normally, it
will be zero or one.
A branch is normally defined by a set of variables and the bounds for these variables.
Branches that are more complex cannot be queried. The return value is the node estimate
for that branch.
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The parameter vars contains the variables for which new bounds will be set in the
i-th branch.
The parameter bounds contains the new bounds for the variables listed in vars;
that is, bounds[j] is the new bound for vars[j].
◆ The parameter dirs indicates the branching direction for the variables in vars.
dir[j] == IloCplex::BranchUp
means that bounds[j] specifies a lower bound for vars[j].
dirs[j] == IloCplex::BranchDown
means that bounds[j] specifies an upper bound for vars[j].
public GoalI::BranchType getBranchType()
This method returns the type of branching IloCplex is going to do for the current
node.
public IloNum getCutoff()
The method 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.
public IloCplex::BranchDirection getDirection(const IloIntVar var)
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 139