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//! Unique identifiers for circuits.
use std::fmt::{Display, Formatter};
use derive_deftly::Deftly;
use tor_memquota::derive_deftly_template_HasMemoryCost;
/// Process-unique identifier for a circuit.
///
/// We could use channel_id.circid here, but the circid can be reused
/// over time. This won't ever repeat on a 64-bit architecture, and
/// is super-unlikely to repeat on a 32-bit architecture. (If
/// we're about to return a repeat value, we assert instead.)
#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Deftly)]
#[derive_deftly(HasMemoryCost)]
pub struct UniqId {
/// Channel that this circuit is on.
chan: usize,
/// ID for the circuit on the channel
circ: usize,
}
impl UniqId {
/// Construct a new circuit UniqId from its parts
pub(crate) fn new(chan: usize, circ: usize) -> Self {
UniqId { chan, circ }
/// A helper for displaying the process-unique identifiers of this circuit.
/// Unlike the [`Display`] implementation, this does not display a `Circ` prefix.
pub fn display_chan_circ(&self) -> impl Display + '_ {
DisplayChanCirc(self)
impl Display for UniqId {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "Circ {}", self.display_chan_circ())
struct DisplayChanCirc<'a>(&'a UniqId);
impl<'a> Display for DisplayChanCirc<'a> {
write!(f, "{}.{}", self.0.chan, self.0.circ)