CPXgetcallbacknodelp

Usage

Mixed Integer Users Only

The routine CPXgetcallbacknodelp() accesses the lp pointer indicating the currently defined linear programming subproblem (LP) from within user-written callbacks. Generally, this pointer may be used only in ILOG CPLEX Callable Library query routines, such as CPXsolution() or CPXgetrows(), documented in the ILOG CPLEX Reference Manual.

CPXgetcallbacknodelp() may be called only when its wherefrom argument has one of the following values:

CPX_CALLBACK_MIP_BRANCH

CPX_CALLBACK_MIP_CUT

CPX_CALLBACK_MIP_HEURISTIC

CPX_CALLBACK_MIP_SOLVE

When the wherefrom argument has the value CPX_CALLBACK_MIP_SOLVE, the subproblem pointer may also be used in ILOG CPLEX optimization routines.

Any modification to the subproblem may result in corruption of the problem and of the ILOG CPLEX environment.

The routine returns a zero on success, and a nonzero if an error occurs. A nonzero return value may mean that the requested value is not available.

int CPXgetcallbacknodelp (CPXCENVptr env, void *cbdata, int wherefrom, CPXLPptr *curlp_p);

Arguments

The pointer to the ILOG CPLEX environment, as returned by one of the CPXopenCPLEX routines.

The cbdata pointer passed to the user-written callback. This parameter must be the value of cbdata passed to the user-written callback.

An integer value indicating where the user-written callback was called from. This parameter must be the value of the wherefrom passed to the user-written callback.

The lp pointer indicating the current subproblem. If no subproblem is defined, the pointer is set to NULL.

status = CPXgetcallbacknodelp (env, cbdata, &curlp);

See Also