Trait Castable

pub trait Castable:
    IDLInterface
    + DomObject
    + Sized {
    // Provided methods
    fn is<T>(&self) -> bool
       where T: DerivedFrom<Self> { ... }
    fn upcast<T>(&self) -> &T
       where T: Castable,
             Self: DerivedFrom<T> { ... }
    fn downcast<T>(&self) -> Option<&T>
       where T: DerivedFrom<Self> { ... }
}

A trait to hold the cast functions of IDL interfaces that either derive or are derived from other interfaces.

Provided Methods

fn is<T>(&self) -> bool

where T: DerivedFrom<Self>,

Check whether a DOM object implements one of its deriving interfaces.

fn upcast<T>(&self) -> &T

where T: Castable, Self: DerivedFrom<T>,

Cast a DOM object upwards to one of the interfaces it derives from.

fn downcast<T>(&self) -> Option<&T>

where T: DerivedFrom<Self>,

Cast a DOM object downwards to one of the interfaces it might implement.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors