Struct sp_trie::KeySpacedDB

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

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

Implementations

impl<'a, DB: ?Sized, H> KeySpacedDB<'a, DB, H>

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> + ?Sized, 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.