Struct WeakSRc 

pub struct WeakSRc<Storage, T>
where
    Storage: SharedStorage,
{ /* private fields */ }

Weak counterpart to SRc.

A weak handle must be upgraded before borrowing. This keeps “the shared value was dropped” separate from the existing state/storage borrow errors.

let shared = SRcRefCell::<Connection>::new::<Disconnected>(connection);
let weak = shared.downgrade();

if let Some(shared) = weak.upgrade() {
    let disconnected = shared.borrow::<Disconnected>()?;
}

Implementations

impl<Storage, T> WeakSRc<Storage, T>

where Storage: SharedStorage,

pub fn upgrade(&self) -> Option<SRc<Storage, T>>

Attempts to recover a strong Rc-backed shared-state handle.

None means no strong SRc handle exists anymore. Some does not imply the requested state is currently available; use borrow::<State>() on the upgraded value to perform the state check.

Trait Implementations

impl<Storage, T> Clone for WeakSRc<Storage, T>

where Storage: SharedStorage,

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.