Trait Backoff 

pub trait Backoff:
    Iterator<Item = Duration>
    + Send
    + Sync
    + Unpin { }

Backoff is an Iterator that returns Duration.

• Some(Duration) indicates the caller should sleep(Duration) and retry the request.
• None indicates the limits have been reached, and the caller should return the current error instead.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<T> Backoff for T

where T: Iterator<Item = Duration> + Send + Sync + Unpin,