Struct VBox

pub struct VBox { /* private fields */ }

A type erased Box of trait object that stores the vtable pointer.

This is just like a Box<dyn Trait> but erases type Trait so that the channel for sending it does not need to have Trait as one of its type parameters. Only the sending end and the receiving end need to agree on the type parameters.

Internally, it stores the trait object’s data pointer in a Box<dyn Any>, so that the Drop::drop() will be called when the wrapper is dropped. And it stores the vtable pointer in another usize to make sure it is Send.

Implementations

impl VBox

pub fn new(data: Box<dyn Any + Send>, vtable: usize, type_id: TypeId) -> Self

Create a new VBox. Do not use it directly. Use into_vbox! instead.

pub fn unpack(self) -> (Box<dyn Any + Send>, usize, TypeId)

Unpack the VBox and return the fields to rebuild the original trait object. Do not use it directly. Use from_vbox! instead.