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 */);