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The routine CPXgetcallbackseqinfo accesses information
about nodes during the MIP optimization from within user-written callbacks.
This routine may be called only when the value of its wherefrom argument is
CPX_CALLBACK_MIP_NODE. The information accessed from this
routine can also be accessed with the routine
CPXgetcallbacknodeinfo. Nodes are not stored by sequence
number but by node number, so using the routine
CPXgetcallbackseqinfo can be much more time-consuming than
using the routine CPXgetcallbacknodeinfo.
A typical use of this routine would be to obtain the node number of a node
for which the sequence number is known and then use that node number to
select the node with the node callback.
seqnum
refers to a node in a node file,
CPXgetcallbacknodeinfo
returns the value CPXERR_NODE_ON_DISK.
This argument must be the value of cbdata passed
to the user-written callback.
This argument must be the value of wherefrom passed to the
user-written callback.
For a summary of possible values, refer to the table titled
Information Requested for a User-Written Node Callback
in the description of
CPXgetcallbacknodeinfo.
| env | A pointer to the CPLEX environment, as returned by |
| cbdata | The pointer passed to the user-written callback. This argument must be the value of |
| wherefrom | An integer value indicating where the user-written callback was called from. This argument must be the value of |
| seqid | The sequence number of the node for which information is requested. |
| whichinfo | An integer indicating which information is requested. For a summary of possible values, refer to the table titled
Information Requested for a User-Written Node Callback
in the description of
|
| result_p | A generic pointer to a variable of type |
CPXERR_NODE_ON_DISK indicates an attempt to access a node currently located in a node file on disk.