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# XSLPsetcbiterend, XPRSsetcbslpiterend

Purpose
Set a user callback to be called at the end of each SLP iteration
Topic areas
Callback, SLP
Synopsis
`int XPRS_CC XSLPsetcbiterend(XSLPprob prob, int (XPRS_CC *iterend) (XSLPprob cbprob, void *cbdata), void *data);`
Arguments

prob | The current SLP problem.
iterend | The function to be called at the end of each SLP iteration. iterend returns an integer value. If the return value is nonzero, the SLP iterations will stop.
cbprob | The problem passed to the callback function.
cbdata | The user-defined object passed as data to XSLPsetcbiterend.
data | A user-defined object, which can be used for any purpose by the function. data is passed to iterend as cbdata.

Example
The following example sets up a callback to be executed at the end of each SLP iteration. It records the number of LP iterations in the latest optimization and stops if there were fewer than 10:

    XSLPsetcbiterend(prob, CBIterEnd, NULL);

A suitable callback function might resemble this:

    int XPRS_CC CBIterEnd(XSLPprob MyProb, void *Obj) {
      int nIter;
      XPRSprob xprob;
      XSLPgetptrattrib(MyProb, XSLP_XPRSPROBLEM, &xprob);
      XPRSgetintattrib(xprob, XPRS_SIMPLEXITER, &nIter);
      if (nIter < 10) return 1;
      return 0;
    }

The data argument is not used here, and so is passed as NULL.
Further information
This callback can be used at the end of each SLP iteration to carry out any further processing and/or stop any further SLP iterations.
Related topics
XSLPsetcbiterstart, XSLPsetcbitervar
Parent Topic Library functions and the programming interface

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