Struct btlib::collections::bijection::Bijection

pub struct Bijection<K, V> { /* private fields */ }

Implements a bijection (one-to-one function) between a set of keys and a set of values. Mapping from key to value and from value to key are both O(1) operations.

Implementations

impl<K, V> Bijection<K, V>

pub fn new(default_key: K, default_value: V) -> Self

Creates a new Bijection with the given default key and value.

pub fn k2v(&self) -> &HashMapWithDefault<K, V>

Returns a reference to the hash table which maps keys to values.

pub fn v2k(&self) -> &HashMapWithDefault<V, K>

Returns a reference to the hash table which maps values to keys.

impl<K: Clone + Hash + Eq, V: Clone + Hash + Eq> Bijection<K, V>

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

Inserts the given (key, value) pair. If this replaces an existing pair, then the old pair is returned.

impl<K: Hash + Eq, V> Bijection<K, V>

pub fn value<Q: ?Sized + Hash + Eq>(&self, key: &Q) -> &Vwhere K: Borrow<Q>,

Returns the value associated with the given key. If no value is associated, then the default value is returned.

impl<K, V: Hash + Eq> Bijection<K, V>

pub fn key<R: ?Sized + Hash + Eq>(&self, value: &R) -> &Kwhere V: Borrow<R>,

Returns the key associated with the given value. If no key is associated, then the default key is returned.