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XSLPsetcbslpstart

Purpose
Set a user callback to be called at the start of the SLP optimization
Synopsis
int XPRS_CC XSLPsetcbslpstart(XSLPprob prob, int (XPRS_CC *slpstart) (XSLPprob cbprob, void *cbdata), void *data);
Arguments
prob 
The current SLP problem.
slpstart 
The function to be called at the start of the SLP optimization. slpstart returns an integer value. If the return value is nonzero, the optimization will not be carried out.
cbprob 
The problem passed to the callback function.
cbdata 
The user-defined object passed as data to XSLPsetcbslpstart.
data 
Address of a user-defined object, which can be used for any purpose by the function. data is passed to slpstart as cbdata.
Example
The following example sets up a callback to be executed at the start of the SLP optimization. It allocates memory to a user-defined object to be used during the optimization: 
void *ObjData;
ObjData = NULL;
XSLPsetcbslpstart(prob, CBSlpStart, &ObjData);
A suitable callback function might resemble this: 
int XPRS_CC CBSlpStart(XSLPprob MyProb, void *Obj) {
  void *ObjData;
  ObjData = * (void **) Obj;
  if (ObjData) free(ObjData);
  * (void **) Obj = malloc(99*sizeof(double));
  return 0;
}
Further information
This callback can be used at the start of the SLP optimization to carry out any housekeeping before the optimization actually starts. Note that a nonzero return code from the callback will terminate the optimization immediately.
Related topics
XSLPsetcbslpend

Parent Topic Library functions

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