Struct WeakSArc 

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

Weak counterpart to SArc.

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

match weak.upgrade() {
    Some(shared) => {
        let disconnected = shared.borrow::<Disconnected>()?;
    }
    None => {
        // All strong handles were dropped.
    }
}

Implementations

impl<Storage, T> WeakSArc<Storage, T>

where Storage: SharedStorage,

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

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

This mirrors std::sync::Weak::upgrade. A successful upgrade only restores ownership of the shared container; typestate validation still happens at the later borrow/borrow_mut call.

Trait Implementations

impl<Storage, T> Clone for WeakSArc<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.