Function igraph_similarity_jaccard_pairs 

pub unsafe extern "C" fn igraph_similarity_jaccard_pairs(
    graph: *const igraph_t,
    res: *mut igraph_vector_t,
    pairs: *const igraph_vector_int_t,
    mode: igraph_neimode_t,
    loops: igraph_bool_t,
) -> igraph_error_t