Struct Lookup 

pub struct Lookup<'a, L: TrieLayout, Q: Query<L::Hash>> {
    pub db: &'a dyn HashDBRef<L::Hash, DBValue>,
    pub query: Q,
    pub hash: TrieHash<L>,
}

Trie lookup helper object.

Fields

db: &'a dyn HashDBRef<L::Hash, DBValue>

database to query from.

query: Q

Query object to record nodes and transform data.

hash: TrieHash<L>

Hash to start at

Implementations

impl<'a, L, Q> Lookup<'a, L, Q>

where L: TrieLayout, Q: Query<L::Hash>,

pub fn look_up( self, key: NibbleSlice<'_>, ) -> Result<Option<Q::Item>, TrieHash<L>, CError<L>>

Look up the given key. If the value is found, it will be passed to the given function to decode or copy.