Enum Entry 

pub enum Entry<'a, Key: Hash + Eq, Value> {
    Occupied(OccupiedEntry<'a, Key, Value>),
    Vacant(VacantEntry<'a, Key, Value>),
}

A view into a single entry in the LFU cache, which may either be vacant or occupied.

This enum is constructed from the entry function on any of the LFU caches.

Variants

Occupied(OccupiedEntry<'a, Key, Value>)

An occupied entry.

Vacant(VacantEntry<'a, Key, Value>)

A vacant entry.

Implementations

impl<'a, Key: Hash + Eq, Value> Entry<'a, Key, Value>

pub fn or_insert(self, default: Value) -> &'a mut Value

Ensures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value in the entry.

pub fn or_insert_with<F>(self, default: F) -> &'a mut Value

where F: FnOnce() -> Value,

Ensures a value is in the entry by inserting the result of the default function if empty, and returns a mutable reference to the value in the entry.

pub fn or_insert_with_key<F>(self, default: F) -> &'a mut Value

where F: FnOnce(&Key) -> Value,

Ensures a value is in the entry by inserting, if empty, the result of the default function. This method allows for generating key-derived values for insertion by providing the default function a reference to the key that was moved during the .entry(key) method call.

The reference to the moved key is provided so that cloning or copying the key is unnecessary, unlike with .or_insert_with(|| ... ).

pub fn key(&self) -> &Key

Returns a reference to this entry’s key.

pub fn key_rc(&self) -> Rc<Key>

Returns the Rc to this entry’s key.

pub fn and_modify<F>(self, f: F) -> Self

where F: FnOnce(&mut Value),

Provides in-place mutable access to an occupied entry before any potential inserts into the map.

impl<'a, Key: Hash + Eq, Value: Default> Entry<'a, Key, Value>

pub fn or_default(self) -> &'a mut Value

Ensures a value is in the entry by inserting the default value if empty, and returns a mutable reference to the value in the entry.