pub trait VTable<T> {
fn build_vtable() -> Self;
}Expand description
VTable defines a type that represents a virtual function table for some type T.
T is different than a type that can be turned into a trait object like Box<dyn Any>
because a VTable effectively decouples the type’s behaviour from the data it contains.
This mechanism allows the virtual function table to be attached to a homogeneous container, to prevent storing duplicates of these tables for each type instance stored in the container.
This is precisely how it is used to build VecDyn<V>, which is generic over the virtual table
rather than the type itself.