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# XPRSaddcbbarlog

Purpose
Declares a barrier log callback function, called at each iteration during the interior point algorithm. This callback function will be called in addition to any barrier log callbacks already added by XPRSaddcbbarlog. This functionality is not available for the hybrid gradient method.
Topic areas
Callback, Barrier
Synopsis
`int XPRS_CC XPRSaddcbbarlog (XPRSprob prob, int (XPRS_CC *barlog)(XPRSprob cbprob, void *cbdata), void *data, int priority);`
Arguments

prob | The current problem.
barlog | The callback function itself, which takes arguments cbprob and cbdata, and has an integer return value. If the value returned by barlog is nonzero, the solution process will be interrupted. This function is called at every barrier iteration.
cbprob | The problem passed to the callback function, barlog.
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, barlog.
priority | An integer that determines the order in which multiple barrier 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.

Example
This simple example prints a line to the screen for each iteration of the algorithm.

    XPRSaddcbbarlog(prob,barLog,NULL,0);
    XPRSlpoptimize(prob,"b");

The callback function might resemble:

    int XPRS_CC barLog(XPRSprob prob, void *data)
    {
      printf("Next barrier iteration\n");
    }

Further information
If the callback function returns a nonzero value, the Optimizer run will be interrupted.
Related topics
XPRSremovecbbarlog, XPRSaddcbmiplog, XPRSaddcblplog, XPRSaddcbmessage.
Parent Topic Console and Library Functions

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