Enum Entry 

pub enum Entry<'a, 's, A: Allocator, K: PartialOrd + Debug, V, B: ArrayLength>
where
    U2: Mul<B>,
    Prod<U2, B>: ArrayLength,
    U1: Add<Prod<U2, B>>,
    Sum<U1, Prod<U2, B>>: ArrayLength,
{
    Vacant(VacantEntry<'a, 's, A, K, V, B>),
    Occupied(OccupiedEntry<'a, 's, A, K, V, B>),
}

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

This enum is constructed from the entry method on CompressedBTreeMap.

Variants

Vacant(VacantEntry<'a, 's, A, K, V, B>)

A vacant entry.

Occupied(OccupiedEntry<'a, 's, A, K, V, B>)

An occupied entry.

Implementations

impl<'a, 's, A: Allocator, K: PartialOrd + Debug, V, B: ArrayLength> Entry<'a, 's, A, K, V, B>

where U2: Mul<B>, Prod<U2, B>: ArrayLength, U1: Add<Prod<U2, B>>, Sum<U1, Prod<U2, B>>: ArrayLength,

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

where F: FnOnce(&mut V),

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

pub fn key(&self) -> &K

Returns a reference to this entry’s key.

pub fn insert(self, v: V) -> AllocResult<Option<V>>

Ensures a value is in the entry by inserting the provided value if empty, and returns the old value if the entry was occupied.

Errors

Will return Err if the allocation fails.

pub fn unwrap_occupied(self) -> OccupiedEntry<'a, 's, A, K, V, B>

Returns the OccupiedEntry if this entry is occupied, panics otherwise.