ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::BranchCallbackI
This method offers the same facilities as the other methods
IloCplex::BranchCallbackI::makeBranch, but for a branch specified by a
set of constraints and a set of variables.
protected NodeId makeBranch(const IloConstraintArray cons,
const IloNumVarArray vars,
const IloNumArray bounds,
const IloCplex::BranchDirectionArray dirs,
IloNum objestimate,
NodeData * data)
This method offers the same facilities as the other methods
IloCplex::BranchCallbackI::makeBranch, but for a branch specified by a
set of constraints and a set of variables.
protected NodeId makeBranch(const IloConstraint con,
IloNum objestimate,
NodeData * data)
This method offers the same facilities for a branch specified by only one constraint as
IloCplex::BranchCallbackI::makeBranch does for a branch specified by a
set of constraints.
protected NodeId makeBranch(const IloConstraintArray cons,
IloNum objestimate,
NodeData * data)
This method overrides the branch chosen by an instance of IloCplex, by specifying a
branch on constraints. A method named makeBranch can be called zero, one, or two
times in every invocation of the branch callback. If you call it once, it creates one node;
it you call it twice, it creates two nodes (one node at each call). If you call it more than
twice, it throws an exception.
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The parameter cons specifies an array of constraints that are to be added for the
subnode being created.
The parameter objestimate provides an estimate of the resulting optimal
objective value for the subnode specified by this branch. The invoking instance of
IloCplex may use this estimate to select nodes to process. Providing a wrong
estimate will not influence the correctness of he solution, but it may influence
performance. Using the objective value of the current node is usually a safe choice.
The parameter data allows you to add an object of type
IloCplex::MIPCallbackI::NodeData to the node representing the branch
created by the makeBranch call. Such data objects must be instances of a userwritten
subclass of IloCplex::MIPCallbackI::NodeData.
protected NodeId makeBranch(const IloIntVar var,
IloNum bound,
IloCplex::BranchDirection dir,
IloNum objestimate,
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 89