Trait trie_db::HashDBRef

pub trait HashDBRef<H, T> where
    H: Hasher, {
    fn get(
        &self, 
        key: &<H as Hasher>::Out, 
        prefix: (&[u8], Option<u8>)
    ) -> Option<T>;
    fn contains(
        &self, 
        key: &<H as Hasher>::Out, 
        prefix: (&[u8], Option<u8>)
    ) -> bool;
}

Trait for immutable reference of HashDB.

Required methods

fn get(
    &self,
    key: &<H as Hasher>::Out,
    prefix: (&[u8], Option<u8>)
) -> Option<T>

Look up a given hash into the bytes that hash to it, returning None if the hash is not known.

fn contains(
    &self,
    key: &<H as Hasher>::Out,
    prefix: (&[u8], Option<u8>)
) -> bool

Check for the existance of a hash-key.

Implementors

impl<'a, H, T> HashDBRef<H, T> for &'a (dyn HashDB<H, T> + 'a) where
    H: Hasher, 

impl<'a, H, T> HashDBRef<H, T> for &'a mut (dyn HashDB<H, T> + 'a) where
    H: Hasher, 

impl<H, KF, T, M> HashDBRef<H, T> for MemoryDB<H, KF, T, M> where
    H: KeyHasher,
    T: Default + PartialEq<T> + for<'a> From<&'a [u8]> + Clone + Send + Sync,
    KF: KeyFunction<H> + Send + Sync,
    M: MemTracker<T> + Send + Sync, 

impl<'a, DB, H, T> HashDBRef<H, T> for KeySpacedDB<'a, DB, H> where
    DB: HashDBRef<H, T>,
    H: Hasher,
    T: From<&'static [u8]>,