trait object

A value used only through a trait, whatever its real type.

A trait object (dyn Trait behind a pointer such as &dyn Trait or Box) erases the concrete type and calls methods through a vtable.

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Examples

let channels: Vec<Box<dyn Notifier>> = vec![Box::new(email), Box::new(sms)]; keeps an Email and an Sms in one vector, and c.send(..) works on each.