pub unsafe extern "C" fn igraph_dqueue_int_push(
q: *mut igraph_dqueue_int_t,
elem: igraph_int_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_dqueue_int_push(
q: *mut igraph_dqueue_int_t,
elem: igraph_int_t,
) -> igraph_error_t