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XPRSsetcbnodecutoff

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Purpose

Declares a user node cutoff callback function, called every time a node is cut off as a result of an improved integer solution being found during the Branch and Bound search.

Synopsis

int XPRS_CC XPRSsetcbnodecutoff(XPRSprob prob, void (XPRS_CC *fucn)(XPRSprob my_prob, void *my_object, int nodnum), void *object);

Arguments

prob	The current problem.
fucn	The callback function, which takes three arguments, my_prob, my_object and nodnum, and has no return value. This function is called every time a node is cut off as the result of an improved integer solution being found.
my_prob	The problem passed to the callback function, fucn.
my_object	The user-defined object passed as object when setting up the callback with XPRSsetcbnodecutoff.
nodnum	The number of the node that is cut off.
object	A user-defined object to be passed to the callback function, fucn.

Example

The following notifies the user whenever a node is cutoff during the global search:

XPRSsetcbnodecutoff(prob,Cutoff,NULL);
XPRSmaxim(prob,"g");

The callback function might resemble:

void XPRS_CC Cutoff(XPRSprob prob, void *obj, int node)
{
  printf("Node %d cutoff\n", node);
}

See the example depthfirst.c on the Xpress‑MP CD-ROM.

Further information

This function allows the user to keep track of the eligible nodes.

Related topics

XPRSsetcbchgnode, XPRSsetcboptnode, XPRSsetcbinfnode, XPRSsetcbintsol, XPRSsetcbchgbranch, XPRSsetcbprenode.

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