Struct sp_trie::KeySpacedDB

pub struct KeySpacedDB<'a, DB, H>(_, _, _);

HashDB implementation that append a encoded prefix (unique id bytes) in addition to the prefix of every key value.

Implementations

impl<'a, DB, H> KeySpacedDB<'a, DB, H> where
    H: Hasher, 

pub fn new(db: &'a DB, ks: &'a [u8]) -> Self

instantiate new keyspaced db

Trait Implementations

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

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.