Initializing help system before first use

XPRSaddcbprenode

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.
Synopsis
int XPRS_CC XPRSaddcbprenode(XPRSprob prob, void (XPRS_CC *f_prenode)(XPRSprob my_prob, void *my_object, int *nodinfeas), void *object, int priority);
Arguments
prob 
The current problem.
f_prenode 
The callback function, which takes three arguments, my_prob, my_object and nodinfeas, and has no return value. This function is called before a node is reoptimized and the node may be made infeasible by setting *nodinfeas to 1.
my_prob 
The problem passed to the callback function, f_prenode.
my_object 
The user-defined object passed as object when setting up the callback with XPRSaddcbprenode.
nodinfeas 
The feasibility status. If set to a nonzero value by the user, the current node will be declared infeasible by the Optimizer.
object 
A user-defined object to be passed to the callback function, f_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* object, int *nodinfeas)
{
 *nodinfeas = 0; /* set to 1 if node is infeasible */
}
Related topics
XPRSremovecbprenode, XPRSaddcbchgnode, XPRSaddcbinfnode, XPRSaddcbintsol, XPRSaddcbnodecutoff, XPRSaddcboptnode.

Parent Topic Console and Library Functions

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