Function sp_trie::prefixed_key

pub fn prefixed_key<H>(
    key: &<H as Hasher>::Out,
    prefix: (&[u8], Option<u8>)
) -> Vec<u8, Global> where
    H: Hasher,

Various re-exports from the memory-db crate. Derive a database key from hash value of the node (key) and the node prefix.