Trait Upgrade

pub trait Upgrade: Sized {
    type Strong;

    // Required method
    fn upgrade(&self) -> Option<Self::Strong>;
}

Trait for generalizing upgrading a weak reference to a strong reference.

Required Associated Types

type Strong

Strong reference type.

Required Methods

fn upgrade(&self) -> Option<Self::Strong>

Try upgrading a weak reference to a strong reference.

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.

Implementations on Foreign Types

impl<T> Upgrade for Weak<T>

type Strong = Rc<T>

fn upgrade(&self) -> Option<<Weak<T> as Upgrade>::Strong>

impl<T> Upgrade for Weak<T>

type Strong = Arc<T>

fn upgrade(&self) -> Option<<Weak<T> as Upgrade>::Strong>

impl<T> Upgrade for PhantomData<T>

type Strong = PhantomData<T>

fn upgrade(&self) -> Option<<PhantomData<T> as Upgrade>::Strong>

Implementors

impl<T> Upgrade for WeakRef<T>

where T: Downgrade + ObjectType,

type Strong = T

impl<T> Upgrade for ObjectImplWeakRef<T>

where T: ObjectSubclass,

type Strong = ObjectImplRef<T>