| Overview | Group | Index | Concepts |
This is an advanced routine. Advanced routines typically demand a thorough understanding of the algorithms used by ILOG CPLEX. Thus they incur a higher risk of incorrect behavior in your application, behavior that can be difficult to debug. Therefore, ILOG encourages you to consider carefully whether you can accomplish the same task by means of other Callable Library routines instead.
The routine CPXgetcallbacknodestat is used to get the
optimization status of the subproblem at the current node from within a
user-written callback during MIP optimization.
The optimization status will be either optimal or unbounded. An unbounded
status can occur when some of the constraints are being treated as lazy
constraints. When the node status is unbounded, then the function
CPXgetcallbacknodex returns a ray that can be used to decide
which lazy constraints need to be added to the subproblem.
This routine may be called only when the value of the
wherefrom argument is CPX_CALLBACK_MIP_CUT.
Example
status = CPXgetcallbacknodestat (env, cbdata, wherefrom,
&nodestatus);| env | A pointer to the CPLEX environment, as returned by |
| cbdata | The pointer passed to the user-written callback. This parameter must be the value of |
| wherefrom | An integer value indicating from where the user-written callback was called. The parameter must be the value of |
| nodestat_p | A pointer to an integer where the node subproblem optimization status is to be returned. The values of |