Initializing help system before first use

XPRSaddcbprenode

Purpose
Declares a preprocess node callback function, called before the LP relaxation of a node has been optimized, so the solution at the node will not be available. This callback function will be called in addition to any callbacks already added by XPRSaddcbprenode.
Topic areas
Callback, Branch and Bound Search
Synopsis
int XPRS_CC XPRSaddcbprenode(XPRSprob prob, void (XPRS_CC *prenode)(XPRSprob cbprob, void *cbdata, int *p_infeasible), void *data, int priority);
Arguments
prob 
The current problem.
prenode 
The callback function, which takes three arguments, cbprob, cbdata and p_infeasible, and has no return value. This function is called before a node is reoptimized and the node may be made infeasible by setting *p_infeasible to 1.
cbprob 
The problem passed to the callback function, prenode.
cbdata 
The user-defined data passed as data when setting up the callback with XPRSaddcbprenode.
p_infeasible 
The feasibility status. If set to a nonzero value by the user, the current node will be declared infeasible by the Optimizer.
data 
A user-defined data to be passed to the callback function, prenode.
priority 
An integer that determines the order in which multiple preprocess node 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 example notifies the user before each node is processed: 
XPRSaddcbprenode(prob, preNode, NULL, 0);
XPRSmipoptimize(prob,"");
The callback function might resemble: 
void XPRS_CC preNode(XPRSprob prob, void* data, int *p_infeasible)
{
 *p_infeasible = 0; /* set to 1 if node is infeasible */
}
Related topics
XPRSremovecbprenode, XPRSaddcbchgnode, XPRSaddcbinfnode, XPRSaddcbintsol, XPRSaddcbnodecutoff, XPRSaddcboptnode.

Parent Topic Console and Library Functions

© 2001-2025 Fair Isaac Corporation. All rights reserved. This documentation is the property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except solely for internal evaluation purposes to determine whether to purchase a license to the software described in this documentation, or as otherwise set forth in a written software license agreement between you and FICO (or a FICO affiliate). Use of this documentation and the software described in it must conform strictly to the foregoing permitted uses, and no other use is permitted.