Enum Entry 

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

Available on crate feature btree only.

Entry into a BTreeMap for in-place manipulation

Variants

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

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

Implementations

impl<'a, K: Ord + Clone + Sized, V: Sized> Entry<'a, K, V>

pub fn exists(&self) -> bool

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

where K: Ord,

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 V

where F: FnOnce() -> V, K: Ord,

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 key(&self) -> &K

Returns a reference to this entry’s key.

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 tree.

pub fn move_backward(self) -> Result<OccupiedEntry<'a, K, V>, Self>

Move to previous OccupiedEntry

When reaching the front, return the original entry in Err()

pub fn move_forward(self) -> Result<OccupiedEntry<'a, K, V>, Self>

Move to next OccupiedEntry

When reaching the end, return the original entry in Err()

pub fn peak_backward(&self) -> Option<(&'a K, &'a V)>

Peak previous OccupiedEntry

pub fn peak_forward(&self) -> Option<(&'a K, &'a V)>

Peak the next OccupiedEntry

Trait Implementations

impl<'a, K: Ord + Clone + Sized + Debug, V: Sized + Debug> Debug for Entry<'a, K, V>

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

Formats the value using the given formatter.