Trait patricia_trie::Query

pub trait Query {
    type Item;
    fn decode(self, _: &[u8]) -> Self::Item;

    fn record(&mut self, &H256, &[u8], u32) { ... }
}

Description of what kind of query will be made to the trie.

This is implemented for any &mut recorder (where the query will return a DBValue), any function taking raw bytes (where no recording will be made), or any tuple of (&mut Recorder, FnOnce(&[u8]))

Associated Types

type Item

Output item.

Required Methods

fn decode(self, _: &[u8]) -> Self::Item

Decode a byte-slice into the desired item.

Provided Methods

fn record(&mut self, &H256, &[u8], u32)

Record that a node has been passed through.

Implementations on Foreign Types

impl<'a, F, T> Query for (&'a mut Recorder, F) where
    F: FnOnce(&[u8]) -> T, 

type Item = T

fn decode(self, value: &[u8]) -> T

fn record(&mut self, hash: &H256, data: &[u8], depth: u32)

Implementors

• impl<'a> Query for &'a mut Recorder type Item = DBValue;
• impl<F, T> Query for F where
    F: for<'a> FnOnce(&'a [u8]) -> T,  type Item = T;