Trait hash_db::HashDBRef

[+] Show declaration

pub trait HashDBRef<H: Hasher, T> {
    fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> Option<T>;
    fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool;
}

[−] Expand description

Trait for immutable reference of HashDB.

Required methods

fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> Option<T>[−]

Look up a given hash into the bytes that hash to it, returning None if the hash is not known.

fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool[−]

Check for the existance of a hash-key.

Implementors

impl<'a, H: Hasher, T> HashDBRef<H, T> for &'a dyn HashDB<H, T>[+]

[+] Show hidden undocumented items

fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> Option<T>

fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool

impl<'a, H: Hasher, T> HashDBRef<H, T> for &'a mut dyn HashDB<H, T>[+]

[+] Show hidden undocumented items

fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> Option<T>

fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool

impl<H, KF, T> HashDBRef<H, T> for MemoryDB<H, KF, T> where     H: KeyHasher,     T: Default + PartialEq<T> + for<'a> From<&'a [u8]> + Clone + Send + Sync,     KF: Send + Sync + KeyFunction<H>,

impl<'a, DB, H, T> HashDBRef<H, T> for KeySpacedDB<'a, DB, H> where     DB: HashDBRef<H, T>,     H: Hasher,     T: From<&'static [u8]>,