Function igraph_sbm_game 

pub unsafe extern "C" fn igraph_sbm_game(
    graph: *mut igraph_t,
    pref_matrix: *const igraph_matrix_t,
    block_sizes: *const igraph_vector_int_t,
    directed: igraph_bool_t,
    allowed_edge_types: igraph_edge_type_sw_t,
) -> igraph_error_t