Enum Entry

pub enum Entry<'a, K, V>
where
    K: Ord + Clone,
    V: Clone,
{
    Occupied(OccupiedEntry<'a, K, V>),
    Vacant(VacantEntry<'a, K, V>),
}

A handle for a key and its associated value.

Variants

Occupied(OccupiedEntry<'a, K, V>)

An entry which exists in the map.

Vacant(VacantEntry<'a, K, V>)

An entry which doesn’t exist in the map.

Implementations

impl<'a, K, V> Entry<'a, K, V>

where K: Ord + Clone, V: Clone,

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

Insert the default value provided if there was no value already, and return a mutable reference to the value.

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

where F: FnOnce() -> V,

Insert the default value from the provided function if there was no value already, and return a mutable reference to the value.

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

where V: Default,

Insert a default value if there was no value already, and return a mutable reference to the value.

pub fn key(&self) -> &K

Get the key for this entry.

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

where F: FnOnce(&mut V),

Call the provided function to modify the value if the value exists.