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> { ... }
}Expand description
A trait to hold the cast functions of IDL interfaces that either derive or are derived from other interfaces.
Provided Methods§
Sourcefn is<T>(&self) -> boolwhere
T: DerivedFrom<Self>,
fn is<T>(&self) -> boolwhere
T: DerivedFrom<Self>,
Check whether a DOM object implements one of its deriving interfaces.
Sourcefn upcast<T>(&self) -> &Twhere
T: Castable,
Self: DerivedFrom<T>,
fn upcast<T>(&self) -> &Twhere
T: Castable,
Self: DerivedFrom<T>,
Cast a DOM object upwards to one of the interfaces it derives from.
Sourcefn downcast<T>(&self) -> Option<&T>where
T: DerivedFrom<Self>,
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.