public static extern unsafe int lis_solve(
     NativeLisMatrix *A, NativeLisVector *b, NativeLisVector *x, NativeLisSolver *solver);
 public static extern unsafe int lis_solver_set_optionC(NativeLisSolver *solver);
 public static extern unsafe int lis_solver_get_iter(NativeLisSolver *solver, int *iter);
 public static extern unsafe int lis_solver_set_option(byte[] text, NativeLisSolver *solver);
 public static extern unsafe int lis_solver_destroy(NativeLisSolver *solver);