CPXXbranchcallbackbranchasCPLEX and CPXbranchcallbackbranchasCPLEX
The routine CPXXbranchcallbackbranchasCPLEX/CPXbranchcallbackbranchasCPLEX accomplishes
two tasks.
int CPXXbranchcallbackbranchasCPLEX( CPXCENVptr env, void * cbdata, int wherefrom, int num, void * userhandle, CPXCNT * seqnum_p )
int CPXbranchcallbackbranchasCPLEX( CPXCENVptr env, void * cbdata, int wherefrom, int num, void * userhandle, int * seqnum_p )
Description
This is an advanced routine. Advanced routines typically demand a thorough understanding of the algorithms used by CPLEX. Thus they incur a higher risk of incorrect behavior in your application, behavior that can be difficult to debug. Therefore, the team encourages you to consider carefully whether you can accomplish the same task by means of other Callable Library routines instead.
The routine CPXXbranchcallbackbranchasCPLEX/CPXbranchcallbackbranchasCPLEX accomplishes
two tasks. First, it specifies that the
branches to be taken from the current node must be the same
as the i-th branch CPLEX has selected. Second, it simultaneously
attaches the user data object userhandle to the
new node. This routine can be called only from
within a user-written branch callback function.
For details about the arguments of that user-written branch
callback function (such arguments as nodecnt),
see the documentation of
CPXXsetbranchcallbackfunc/CPXsetbranchcallbackfunc.
Arguments
- env
-
A pointer to the CPLEX environment, as returned by
CPXXopenCPLEX/CPXopenCPLEX. - cbdata
-
A pointer passed to the user-written callback. This argument must be the value of
cbdatapassed to the user-written callback. - wherefrom
-
An integer value that reports where the user-written callback was called from. This argument must be the value of
wherefrompassed to the user-written callback. - num
-
An integer specifying which branch to create. Typically, 0 (zero) is less than or equal to
num, andnumis strictly less thannodecnt, an argument of the user-written callback function. The first branch that CPLEX creates is designated conventionally by 0 (zero) and the second by 1 (one). - userhandle
-
A pointer to user private data that should be associated with the node created by this branch. Can be
NULL. - seqnum_p
- A pointer to an integer. On return, that integer contains the sequence number that CPLEX assigns to the node created from this branch. You can use that sequence number to select this node in later calls to the node callback.