XPRSaddcbslpcascadestart
Purpose
Add a user callback to be called at the start of the cascading process, before any variables have been cascaded
Topic areas
Synopsis
int XPRS_CC XPRSaddcbslpcascadestart(XPRSprob prob, int (XPRS_CC *slpcascadestart) (XPRSprob cbprob, void *cbdata), void *data, int priority);
Arguments
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prob
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The current problem.
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slpcascadestart
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The function to be called at the start of the cascading process.
slpcascadestart returns an integer value. If the return value is nonzero, the cascading process will be omitted for the current SLP iteration, but the optimization will continue. |
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cbprob
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The problem passed to the callback function.
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cbdata
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The user-defined object passed as
data to
XPRSaddcbslpcascadestart.
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data
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Address of a user-defined object, which can be used for any purpose by the function.
data is passed to
slpcascadestart as
cbdata.
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priority
|
An integer that determines the order in which callbacks of this type 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 example sets up a callback to be executed at the start of the cascading process to save the current values of the variables:
double *cSol; XPRSaddcbslpcascadestart(prob, CBCascStart, &cSol, 0);
A suitable callback function might resemble this:
int XPRS_CC CBCascStart(XPRSprob MyProb, void *Obj) {
int iCol, nCol;
double *cSol;
cSol = * (double **) Obj;
XPRSgetintcontrol(MyProb, XPRS_COLS, &nCol);
for (iCol=0;iCol<nCol;iCol++) {
XPRSalltype alltype;
XPRSslpgetcolinfo(prob, XSLP_COLINFO_VALUE, iCol, &alltype);
cSol[iCol] = alltype.value.real;
}
return 0;
}
The
data argument is used here to hold the address of the array
cSol which we populate with the solution values.
Further information
This callback can be used at the start of the cascading, before any of the solution values have been recalculated.
Related topics
XPRSslpcascade,
XPRSaddcbslpcascadeend,
XPRSaddcbslpcascadevar,
XPRSaddcbslpcascadevarfail
XPRSremovecbslpcascadestart
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