Trait MetaInherits

pub trait MetaInherits<Base>: Inherits<Base> + ObjectConstraint { }

Inheritance relationship for Kanzi classes containing metaclass in their definitions.

Metaclasses are used for dynamically verifying inheritance between objects. Hence classes, implementing this trait, can be both upcasted to their base classes and downcasted to their parent classes.

Inherits trait, on contrary, implements only the upcasting.

let node: &Node = screen.upcast_ref();
let screen_2: Option<Screen> = node.clone().downcast()?;
let screen_2 = screen_2.expect("Screen downcasted back to its original type");
assert_eq!(screen, screen_2);

let node_3d: Option<&Node3D> = node.downcast_ref()?;
assert!(node_3d.is_none());

Object Safety

This trait is not object safe.

Implementors

impl<Base, T> MetaInherits<Base> for T

where Base: ObjectConstraint, T: Inherits<Base> + ObjectConstraint,