Trait hash_db::HashDBRef

pub trait HashDBRef<H: Hasher, T> {
    fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> Option<T>;
    fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool;
}

Trait for immutable reference of HashDB.

Required Methods

fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> 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::Out, prefix: Prefix<'_>) -> bool

Check for the existance of a hash-key.

Implementors

impl<'a, H: Hasher, T> HashDBRef<H, T> for &'a dyn HashDB<H, T>

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

impl<H, KF, T, M> HashDBRef<H, T> for MemoryDB<H, KF, T, M>where
    H: KeyHasher,
    T: Default + PartialEq<T> + AsRef<[u8]> + 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> + ?Sized,
    H: Hasher,
    T: From<&'static [u8]>,