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# XPRSaddcbinfnode

Purpose
Declares a user infeasible node callback function, called after the current node has been found to be infeasible during the Branch and Bound search. The callback is also invoked if the current node gets cut off, i.e., if its objective is proven to exceed the current primal bound. This callback function will be called in addition to any callbacks already added by XPRSaddcbinfnode.
Topic areas
Callback, Branch and Bound Search
Synopsis
`int XPRS_CC XPRSaddcbinfnode(XPRSprob prob, void (XPRS_CC *infnode)(XPRSprob cbprob, void *cbdata), void *data, int priority);`
Arguments

prob | The current problem
infnode | The callback function, which takes arguments cbprob and cbdata, and has no return value. This function is called after the current node has been found to be infeasible.
cbprob | The problem passed to the callback function, infnode.
cbdata | The user-defined data passed as data when setting up the callback.
data | A user-defined data to be passed to the callback function, infnode.
priority | An integer that determines the order in which multiple user infeasible node callbacks will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.

Example
The following notifies the user whenever an infeasible node is found during the tree search:

    XPRSaddcbinfnode(prob,nodeInfeasible,NULL,0);
    XPRSmipoptimize(prob,"");

The callback function may resemble:

    void XPRS_CC nodeInfeasible(XPRSprob prob, void *data)
    {
      int node;
      XPRSgetintattrib(prob, XPRS_CURRENTNODE, &node);
      printf("Node %d infeasible\n", node);
    }

See the example depthfirst.c in the examples/optimizer/c folder.
Further information
Nodes that are cut off while not being the active node, are reported in the nodecutoff callback.
Related topics
XPRSremovecbinfnode, XPRSaddcboptnode, XPRSaddcbintsol, XPRSaddcbnodecutoff.
Parent Topic Console and Library Functions

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