Enum Entry

pub enum Entry<'a, K, V> {
    Vacant(VacantEntry<'a, K, V>),
    Occupied(OccupiedEntry<'a, K, V>),
}

Represents a space in a Map that may or may not contains a value.

Variants

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

This entry slot does not yet contain a value

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

This entry slot does contain a value

Implementations

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

where K: Collapse,

pub fn and_modify<F: FnOnce(&mut V)>(self, f: F) -> Entry<'a, K, V>

Run this closure on a mutable reference to the internal value if it is present, otherwise do nothing.

pub fn key(&self) -> &K

A reference to the key

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

Insert into the entry if it is empty the value returned by the closure and return a mutable reference to the new value, otherwise return a mutable reference to the already present value.

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

Insert into the entry this value if it is empty and return a mutable reference to the new value, otherwise return a mutable reference to the already present value.

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

where K: Collapse, V: Default,

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

Insert into the entry the default value if it is empty and return a mutable reference to the new value, otherwise return a mutable reference to the already present value.

Trait Implementations

impl<'a, K: Debug, V: Debug> Debug for Entry<'a, K, V>

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

Formats the value using the given formatter.