Trait rustc_query_system::query::QueryCache[−][src]

pub trait QueryCache: QueryStorage + Sized {
    type Key: Hash + Eq + Clone + Debug;
    type Sharded: Default;
    fn lookup<'s, R, OnHit>(
        &self, 
        state: &'s QueryCacheStore<Self>, 
        key: &Self::Key, 
        on_hit: OnHit
    ) -> Result<R, QueryLookup>
    where
        OnHit: FnOnce(&Self::Stored, DepNodeIndex) -> R;

    fn complete(
        &self, 
        lock_sharded_storage: &mut Self::Sharded, 
        key: Self::Key, 
        value: Self::Value, 
        index: DepNodeIndex
    ) -> Self::Stored;

    fn iter(
        &self, 
        shards: &Sharded<Self::Sharded>, 
        f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex)
    );
}

Associated Types

Required methods

Checks if the query is already computed and in the cache. It returns the shard index and a lock guard to the shard, which will be used if the query is not in the cache and we need to compute it.

Implementors