//! An estimator for various timeouts.
use std::time::Duration;
/// An object used by circuits to compute various timeouts.
///
// This is implemented for the timeout `Estimator` from tor-circmgr.
pub trait TimeoutEstimator: Send + Sync {
/// The estimated circuit build timeout for a circuit of the specified length.
///
// Used by the circuit reactor for deciding when to expire half-streams.
fn circuit_build_timeout(&self, length: usize) -> Duration;
}