ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::BranchCallbackI
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].
protected BranchCallbackI::BranchType getBranchType()
This method returns the type of branching IloCplex is going to do for the current
node.
protected IloInt getNbranches()
This method returns the number of branches IloCplex is going to create at the current
node.
protected NodeId getNodeId()
Returns the NodeId of the current node.
protected IloBool isIntegerFeasible()
This method returns IloTrue if the solution of the current node is integer feasible.
protected NodeId makeBranch(const IloConstraintArray cons,
const IloIntVarArray vars,
const IloNumArray bounds,
const IloCplex::BranchDirectionArray dirs,
IloNum objestimate,
NodeData * data)
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 88