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# XPRSaddcbmiplog

Purpose
Declares a MIP log callback function, called each time the MIP log is printed. This callback function will be called in addition to any callbacks already added by XPRSaddcbmiplog.
Topic areas
Callback, Logging
Synopsis
`int XPRS_CC XPRSaddcbmiplog(XPRSprob prob, int (XPRS_CC *miplog)(XPRSprob cbprob, void *cbdata), void *data, int priority);`
Arguments

prob | The current problem.
miplog | The callback function, which takes arguments cbprob and cbdata, and has an integer return value. This function is called whenever the MIP log is printed as determined by the MIPLOG control.
cbprob | The problem passed to the callback function, miplog.
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, miplog.
priority | An integer that determines the order in which multiple MIP log 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.

Related controls
Integer

MIPLOG | MIP print flag.

Example
The following example prints at each node of the tree search the node number and its depth:

    XPRSsetintcontrol(prob, XPRS_MIPLOG, 3);
    XPRSaddcbmiplog(prob, mipLog, NULL, 0);
    XPRSmipoptimize(prob,"");

The callback function may resemble:

    int XPRS_CC mipLog(XPRSprob prob, void *data)
    {
      int node, nodedepth;

      XPRSgetintattrib(prob, XPRS_NODEDEPTH, &nodedepth);
      XPRSgetintattrib(prob, XPRS_CURRENTNODE, &node);
      printf("Node %d with depth %d has just been processed\n",
             node, nodedepth);

      return 0;
    }

See the example depthfirst.c in the examples/optimizer/c folder.
Further information
If the callback function returns a nonzero value, the tree search will be interrupted.
Related topics
XPRSremovecbmiplog, XPRSaddcbbarlog, XPRSaddcblplog, XPRSaddcbmessage.
Parent Topic Console and Library Functions

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