pub unsafe extern "C" fn igraph_arpack_rssolve(
fun: igraph_arpack_function_t,
extra: *mut c_void,
options: *mut igraph_arpack_options_t,
storage: *mut igraph_arpack_storage_t,
values: *mut igraph_vector_t,
vectors: *mut igraph_matrix_t,
) -> igraph_error_t