Trait differential_dataflow::collection::lookup::Lookup
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pub trait Lookup<K: Eq, V> { fn get_ref<'a>(&'a self, &K) -> Option<&'a V>; fn get_mut<'a>(&'a mut self, &K) -> Option<&'a mut V>; fn entry_or_insert<F: FnOnce() -> V>(&mut self, K, F) -> &mut V; fn remove_key(&mut self, &K) -> Option<V>; }
A map from K to V.
Required Methods
fn get_ref<'a>(&'a self, &K) -> Option<&'a V>
Recovers a reference to the value associated with a key.
fn get_mut<'a>(&'a mut self, &K) -> Option<&'a mut V>
Recovers a mutable referecne to the value associated with a key.
fn entry_or_insert<F: FnOnce() -> V>(&mut self, K, F) -> &mut V
Recovers a mutable reference, inserting a new value if absent.
fn remove_key(&mut self, &K) -> Option<V>
Removes the key and returns its value if it exists.