Trait WeakKeepalive 

pub trait WeakKeepalive: Send + Sync {
    // Required method
    fn upgrade(&self) -> Option<Arc<dyn Keepalive>>;
}

Counterpart to Keepalive: a non-pinning reference to the same underlying resource that can be re-promoted to a Keepalive as long as the resource is still alive.

Required Methods

fn upgrade(&self) -> Option<Arc<dyn Keepalive>>

Re-acquire a strong Keepalive for the underlying resource, or None if the referent has gone away.

Implementors