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XPRSaddcbnodecutoff

XPRSaddcbnodecutoff

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. This callback function will be called in addition to any callbacks already added by XPRSaddcbnodecutoff.
Synopsis
int XPRS_CC XPRSaddcbnodecutoff(XPRSprob prob, void (XPRS_CC *f_nodecutoff)(XPRSprob my_prob, void *my_object, int node), void *object, int priority);
Arguments
prob 
The current problem.
f_nodecutoff 
The callback function, which takes three arguments, my_prob, my_object and node, 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, f_nodecutoff.
my_object 
The user-defined object passed as object when setting up the callback with XPRSaddcbnodecutoff.
node 
The number of the node that is cut off.
object 
A user-defined object to be passed to the callback function, f_nodecutoff.
priority 
An integer that determines the order in which multiple node-optimal 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
The following notifies the user whenever a node is cutoff during the global search: 
XPRSaddcbnodecutoff(prob,Cutoff,NULL,0);
XPRSmipoptimize(prob,"");
The callback function might resemble: 
void XPRS_CC Cutoff(XPRSprob prob, void *object, int node)
{
  printf("Node %d cutoff\n", node);
}
See the example depthfirst.c in the examples/optimizer/c folder.
Further information
This function allows the user to keep track of the eligible nodes. Note that the LP solution will not be available from this callback.
Related topics
XPRSremovecbnodecutoff, XPRSaddcboptnode, XPRSaddcbinfnode, XPRSaddcbintsol.

Parent Topic Console and Library Functions

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