Struct OccupiedEntry

pub struct OccupiedEntry<'a, K, V> { /* private fields */ }

A view into an occupied entry in a IndexMap. It is part of the Entry enum.

Implementations

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

pub fn key(&self) -> &K

Gets a reference to the entry’s key in the map.

Note that this is not the key that was used to find the entry. There may be an observable difference if the key type has any distinguishing features outside of Hash and Eq, like extra fields or the memory address of an allocation.

pub fn get(&self) -> &V

Gets a reference to the entry’s value in the map.

pub fn get_mut(&mut self) -> &mut V

Gets a mutable reference to the entry’s value in the map.

If you need a reference which may outlive the destruction of the Entry value, see into_mut.

pub fn index(&self) -> usize

Return the index of the key-value pair

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

Converts into a mutable reference to the entry’s value in the map, with a lifetime bound to the map itself.

pub fn swap_remove_entry(self) -> (K, V)

Remove and return the key, value pair stored in the map for this entry

Like Vec::swap_remove, the pair is removed by swapping it with the last element of the map and popping it off. This perturbs the position of what used to be the last element!

Computes in O(1) time (average).

pub fn shift_remove_entry(self) -> (K, V)

Remove and return the key, value pair stored in the map for this entry

Like Vec::remove, the pair is removed by shifting all of the elements that follow it, preserving their relative order. This perturbs the index of all of those elements!

Computes in O(n) time (average).

impl<K, V> OccupiedEntry<'_, K, V>

pub fn insert(&mut self, value: V) -> V

Sets the value of the entry to value, and returns the entry’s old value.

pub fn remove(self) -> V

Remove the key, value pair stored in the map for this entry, and return the value.

NOTE: This is equivalent to .swap_remove().

pub fn swap_remove(self) -> V

Remove the key, value pair stored in the map for this entry, and return the value.

Like Vec::swap_remove, the pair is removed by swapping it with the last element of the map and popping it off. This perturbs the position of what used to be the last element!

Computes in O(1) time (average).

pub fn shift_remove(self) -> V

Remove the key, value pair stored in the map for this entry, and return the value.

Like Vec::remove, the pair is removed by shifting all of the elements that follow it, preserving their relative order. This perturbs the index of all of those elements!

Computes in O(n) time (average).

pub fn remove_entry(self) -> (K, V)

Remove and return the key, value pair stored in the map for this entry

NOTE: This is equivalent to .swap_remove_entry().

Trait Implementations

impl<K: Debug, V: Debug> Debug for OccupiedEntry<'_, K, V>

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

Formats the value using the given formatter.

impl<K: Sync, V: Sync> Sync for OccupiedEntry<'_, K, V>