Struct SnapshotStateMap 

pub struct SnapshotStateMap<K, V>
where
    K: Clone + Eq + Hash + 'static,
    V: Clone + 'static,
{ /* private fields */ }

A hash map whose reads subscribe the current scope and whose writes notify its readers, as Jetpack Compose’s SnapshotStateMap. Clones share the same map.

Implementations

impl<K, V> SnapshotStateMap<K, V>

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

pub fn with_runtime<I>(pairs: I, runtime: RuntimeHandle) -> Self

where I: IntoIterator<Item = (K, V)>,

Creates a map holding pairs in runtime.

pub fn as_state(&self) -> State<HashMap<K, V>>

Returns a read-only view of the state that holds the map.

pub fn as_mutable_state(&self) -> MutableState<HashMap<K, V>>

Returns the writable state that holds the map.

pub fn len(&self) -> usize

Returns the number of entries.

pub fn is_empty(&self) -> bool

Returns true if the map has no entries.

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

Returns true if the map has an entry for key.

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

Returns a copy of the value under key, or None if there is none.

pub fn to_hash_map(&self) -> HashMap<K, V>

Returns a copy of the whole map.

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

Stores value under key and returns the value it replaced, if any.

pub fn extend<I>(&self, iter: I)

where I: IntoIterator<Item = (K, V)>,

Inserts all pairs from iter in one write, replacing the values of keys already present.

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

Removes the entry under key and returns its value, or None if there was none.

pub fn clear(&self)

Removes all entries.

pub fn retain<F>(&self, predicate: F)

where F: FnMut(&K, &mut V) -> bool,

Keeps the entries for which predicate returns true. The predicate may change the values it keeps.

Trait Implementations

impl<K, V> Clone for SnapshotStateMap<K, V>

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

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<K, V> Debug for SnapshotStateMap<K, V>

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

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

Formats the value using the given formatter.