Struct Guard 

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

RAII guard for borrowed values. Holds a read lock on the shard.

Intentionally !Send to prevent holding across .await points, which could cause deadlocks or excessive lock contention.

For async contexts, use Cache::get_clone() instead.

Example

// ✅ Good: Guard is dropped before await
let data = {
    let guard = cache.get(&key)?;
    guard.some_field.clone()
};
some_async_fn(data).await;

// ✅ Good: Use get_clone() for async contexts
let value = cache.get_clone(&key)?;
some_async_fn(&value).await;

// ❌ Bad: Would hold lock across await (won't compile in Send context)
let guard = cache.get(&key)?;
some_async_fn().await;
println!("{:?}", *guard);

Trait Implementations

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

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

Formats the value using the given formatter.

impl<V> Deref for Guard<'_, V>

type Target = V

The resulting type after dereferencing.

fn deref(&self) -> &V

Dereferences the value.

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

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

Formats the value using the given formatter.

impl<V: Ord> Ord for Guard<'_, V>

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<V: PartialEq> PartialEq for Guard<'_, V>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<V: PartialOrd> PartialOrd for Guard<'_, V>

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<V: Eq> Eq for Guard<'_, V>

impl<V: Sync> Sync for Guard<'_, V>