Trait Key 

pub trait Key: Any + Debug {
    // Required methods
    fn key_id(&self) -> KeyId;
    fn eq_key(&self, other: &dyn Key) -> bool;
    fn clone_box(&self) -> Box<dyn Key>;
    fn as_any(&self) -> &dyn Any;
}

A type-erased identity used by widgets and reconciliation algorithms. Implementors should be immutable value types.

Required Methods

fn key_id(&self) -> KeyId

Returns a stable, process-local identity for this key value.

fn eq_key(&self, other: &dyn Key) -> bool

Supports equality after type erasure without requiring dyn Key to implement Eq itself.

fn clone_box(&self) -> Box<dyn Key>

Clones a concrete key through a trait object.

fn as_any(&self) -> &dyn Any

Provides a downcast hook for custom key implementations.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Key for KeyHandle

impl Key for UniqueKey

impl<T> Key for ValueKey<T>

where T: Any + Clone + Eq + Hash + Debug,