Function sp_trie::read_trie_value

pub fn read_trie_value<L: TrieLayout, DB: HashDBRef<L::Hash, DBValue>>(
    db: &DB,
    root: &TrieHash<L>,
    key: &[u8],
    recorder: Option<&mut dyn TrieRecorder<TrieHash<L>>>,
    cache: Option<&mut dyn TrieCache<L::Codec>>
) -> Result<Option<Vec<u8>>, Box<TrieError<L>>>

Read a value from the trie.