Trait sp_trie::Query

pub trait Query<H> where
    H: Hasher, {
    type Item;
    fn decode(self, data: &[u8]) -> Self::Item;

    fn record(&mut self, _hash: &<H as Hasher>::Out, _data: &[u8], _depth: u32) { ... }
}

Various re-exports from the trie-db crate. 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.

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Required methods

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

Decode a byte-slice into the desired item.

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Provided methods

fn record(&mut self, _hash: &<H as Hasher>::Out, _data: &[u8], _depth: u32)

Record that a node has been passed through.

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Implementations on Foreign Types

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

type Item = T

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

fn record(&mut self, hash: &<H as Hasher>::Out, data: &[u8], depth: u32)

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Implementors

impl<'a, H> Query<H> for &'a mut Recorder<<H as Hasher>::Out> where
    H: Hasher, 

type Item = Vec<u8>

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

fn record(&mut self, hash: &<H as Hasher>::Out, data: &[u8], depth: u32)

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

type Item = T

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

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