pub unsafe extern "C" fn GRBaddrangeconstrs( model: *mut GRBmodel, numconstrs: c_int, numnz: c_int, cbeg: *const c_int, cind: *const c_int, cval: *const c_double, lower: *const c_double, upper: *const c_double, constrname: *const c_str) -> c_int