Function gurobi_sys::GRBsetcallbackfunc

pub unsafe extern "C" fn GRBsetcallbackfunc(
    model: *mut GRBmodel, 
    cb: extern "C" fn(_: *mut GRBmodel, _: *mut c_void, _: c_int, _: *mut c_void) -> c_int, 
    usrdata: *mut c_void
) -> c_int