Struct HashMap 

pub struct HashMap<K: 'static, V: 'static, S = FixedState> { /* private fields */ }

High-Performance Lock-Free Map.

Implementations

impl<K, V> HashMap<K, V, FixedState>

where K: Hash + Eq + Clone + 'static, V: Clone + 'static,

pub fn new() -> Self

Creates a new empty hash map with FoldHash (FixedState).

impl<K, V, S> HashMap<K, V, S>

where K: Hash + Eq + Clone + 'static, V: Clone + 'static, S: BuildHasher,

pub fn with_hasher(hasher: S) -> Self

Creates a new hash map with custom hasher.

pub fn get<Q>(&self, key: &Q) -> Option<V>

where K: Borrow<Q>, Q: Hash + Eq + ?Sized,

Optimized get operation.

pub fn contains_key<Q>(&self, key: &Q) -> bool

where K: Borrow<Q>, Q: Hash + Eq + ?Sized,

Checks if the key exists.

pub fn insert(&self, key: K, value: V) -> Option<V>

Insert a key-value pair.

pub fn insert_if_absent(&self, key: K, value: V) -> Option<V>

Insert a key-value pair only if the key does not exist. Returns None if inserted, Some(existing_value) if the key already exists.

pub fn remove<Q>(&self, key: &Q) -> Option<V>

where K: Borrow<Q>, Q: Hash + Eq + ?Sized,

Remove a key-value pair.

pub fn clear(&self)

Clear the map.

pub fn is_empty(&self) -> bool

Returns true if the map is empty.

pub fn len(&self) -> usize

Returns the number of elements in the map. Note: This is an O(N) operation as it scans all buckets.

pub fn iter(&self) -> Iter<'_, K, V, S>

Returns an iterator over the map entries. Yields (K, V) clones.

pub fn keys(&self) -> Keys<'_, K, V, S>

Returns an iterator over the map keys. Yields K clones.

pub fn hasher(&self) -> &S

Get the underlying hasher itself.

Trait Implementations

impl<K, V> Default for HashMap<K, V, FixedState>

where K: Hash + Eq + Clone + 'static, V: Clone + 'static,

Available on crate feature std only.

fn default() -> Self

Returns the “default value” for a type.

impl<K, V, S> Drop for HashMap<K, V, S>

fn drop(&mut self)

Executes the destructor for this type.

impl<'a, K, V, S> IntoIterator for &'a HashMap<K, V, S>

where K: Hash + Eq + Clone + 'static, V: Clone + 'static, S: BuildHasher,

type Item = (K, V)

The type of the elements being iterated over.

type IntoIter = Iter<'a, K, V, S>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<K: Send, V: Send, S: Send> Send for HashMap<K, V, S>

impl<K: Sync, V: Sync, S: Sync> Sync for HashMap<K, V, S>