Struct ValueRef 

pub struct ValueRef<'a, V> { /* private fields */ }

ValueRef is returned when invoking get method of the Cache. It wraps a parking_lot::MappedRwLockReadGuard projected directly to the inner value, so the shard read lock is held for the lifetime of the ref.

Auto-trait inheritance follows parking_lot’s GuardMarker:

• Without the send_guard feature (default), the marker is GuardNoSend (a *mut ()), which makes ValueRef neither Send nor Sync. This is the right default for parking_lot, whose RwLock permits same-thread read-guard → write-guard upgrades — sending a guard across threads would break that invariant.
• With the send_guard feature, parking_lot switches the marker to GuardSend, and ValueRef becomes Send (and Sync when V is) automatically. Enabling that feature opts the whole RwLock family out of guard upgrades — see the parking_lot docs for the trade-offs.

Implementations

impl<'a, V> ValueRef<'a, V>

pub fn value(&self) -> &V

Get the reference of the inner value.

pub fn release(self)

Drop self, release the inner RwLockReadGuard, which is the same as drop()

pub fn ttl(&self) -> Duration

Get the expiration time.

impl<V: Copy> ValueRef<'_, V>

pub fn read(self) -> V

Get the value and drop the inner RwLockReadGuard.

Trait Implementations

impl<V> AsRef<V> for ValueRef<'_, V>

fn as_ref(&self) -> &V

Converts this type into a shared reference of the (usually inferred) input type.

impl<V: Debug> Debug for ValueRef<'_, V>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<V: Display> Display for ValueRef<'_, V>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.