Function igraph_maximal_cliques_callback 

pub unsafe extern "C" fn igraph_maximal_cliques_callback(
    graph: *const igraph_t,
    min_size: igraph_int_t,
    max_size: igraph_int_t,
    cliquehandler_fn: igraph_clique_handler_t,
    arg: *mut c_void,
) -> igraph_error_t