ILOG CPLEX C++ API 9.0 Reference Manual

IloCplex::NodeEvaluatorI
branch, 0 (zero) will be returned instead. This method can be called only from the
methods init and evaluate.
protected IloNum getDepth()
This method returns the depth in the search tree of the node currently being evaluated.
The root node is depth 0 (zero); the depth of the current node is its distance from the
root, or equivalently, the number of branches taken to get from the root node to the
current node. This member function can be called only from the methods init and
evaluate.
protected IloNum getEstimatedObjValue()
This method returns the estimated objective value for the node being evaluated. It can be
called only from the methods init and evaluate.
protected IloNum getInfeasibilitySum()
This method returns the sum of infeasibility measures at the node being evaluated. It can
be called only from the methods init and evaluate.
protected IloInt getNinfeasibilities()
This method returns the number of infeasibilities at the node being evaluated. It can be
called only from the methods init and evaluate.
protected NodeId getNodeId()
This method returns the node identifier of the node being evaluated. It can be called only
from the methods init and evaluate.
protected IloNum getObjValue()
This method returns the objective value of the node being evaluated. It can be called
only from the methods init and evaluate.
public virtual void init()
This method is called by IloCplex immediately before the first time evaluate is
called for a node, allowing you to initialize the evaluator based on that node.
Information about the current node can be queried by calling the get methods of
IloCplex::NodeEvaluatorI.
public virtual IloBool subsume(IloNum evalBest,
IloNum evalCurrent)
IloCplex maintains a candidate node for selection as the next node to process. When
choosing the next node, it compares the candidate to all other nodes. If a given node and
the candidate node are governed by the same evaluator, IloCplex calls subsume to
determine whether the node should become the new candidate. The arguments passed to
the subsume call are:
◆
the value previously assigned by the method evaluate to the candidate node as
parameter evalBest, and
ILOG CPLEX C++ API 9.0 REFERENCE M ANUAL 196