Type Alias Virtual 

pub type Virtual<E> = Box<dyn Handler<E>>;

Type alias for a boxed, type-erased Handler.

Use Virtual<E> when you need to store heterogeneous handlers in a collection (e.g. Vec<Virtual<E>>). One heap allocation per handler.

For inline storage (no heap), see FlatVirtual (panics if handler doesn’t fit) or FlexVirtual (inline with heap fallback). Both require the smartptr feature.

Aliased Type

pub struct Virtual<E>(/* private fields */);