pub unsafe extern "C" fn CPXgetheuristiccallbackfunc(
env: CPXCENVptr,
heuristiccallback_p: *mut Option<unsafe extern "C" fn(xenv: CPXCENVptr, cbdata: *mut c_void, wherefrom: c_int, cbhandle: *mut c_void, objval_p: *mut f64, x: *mut f64, checkfeas_p: *mut c_int, useraction_p: *mut c_int) -> c_int>,
cbhandle_p: *mut *mut c_void,
) -> c_int