Trait rustc_const_eval::interpret::AllocMap
source · pub trait AllocMap<K: Hash + Eq, V> {
fn contains_key<Q: ?Sized + Hash + Eq>(&mut self, k: &Q) -> bool
where
K: Borrow<Q>;
fn insert(&mut self, k: K, v: V) -> Option<V>;
fn remove<Q: ?Sized + Hash + Eq>(&mut self, k: &Q) -> Option<V>
where
K: Borrow<Q>;
fn filter_map_collect<T>(&self, f: impl FnMut(&K, &V) -> Option<T>) -> Vec<T>;
fn get_or<E>(
&self,
k: K,
vacant: impl FnOnce() -> Result<V, E>
) -> Result<&V, E>;
fn get_mut_or<E>(
&mut self,
k: K,
vacant: impl FnOnce() -> Result<V, E>
) -> Result<&mut V, E>;
fn get(&self, k: K) -> Option<&V> { ... }
fn get_mut(&mut self, k: K) -> Option<&mut V> { ... }
}Expand description
The functionality needed by memory to manage its allocations
Required Methods
Tests if the map contains the given key.
Deliberately takes &mut because that is sufficient, and some implementations
can be more efficient then (using RefCell::get_mut).
Removes an entry from the map.
Returns data based on the keys and values in the map.
Returns a reference to entry k. If no such entry exists, call
vacant and either forward its error, or add its result to the map
and return a reference to that.