Trait rustc_query_system::query::QueryCache

pub trait QueryCache: Sized {
    type Key: Hash + Eq + Copy + Debug;
    type Value: Copy;

    // Required methods
    fn lookup(&self, key: &Self::Key) -> Option<(Self::Value, DepNodeIndex)>;
    fn complete(&self, key: Self::Key, value: Self::Value, index: DepNodeIndex);
    fn iter(&self, f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex));
}

Required Associated Types

type Key: Hash + Eq + Copy + Debug

type Value: Copy

Required Methods

fn lookup(&self, key: &Self::Key) -> Option<(Self::Value, DepNodeIndex)>

Checks if the query is already computed and in the cache.

fn complete(&self, key: Self::Key, value: Self::Value, index: DepNodeIndex)

fn iter(&self, f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex))

Implementors

impl<K, V> QueryCache for DefaultCache<K, V>where K: Eq + Hash + Copy + Debug, V: Copy,

type Key = K

type Value = V

impl<K, V> QueryCache for VecCache<K, V>where K: Eq + Idx + Copy + Debug, V: Copy,

type Key = K

type Value = V

impl<V> QueryCache for SingleCache<V>where V: Copy,

type Key = ()

type Value = V