Trait trie_db::HashDB[−][src]

pub trait HashDB<H, T>: Send + Sync + AsHashDB<H, T> where
    H: Hasher, {
    pub fn get(
        &self, 
        key: &<H as Hasher>::Out, 
        prefix: (&[u8], Option<u8>)
    ) -> Option<T>;

    pub fn contains(
        &self, 
        key: &<H as Hasher>::Out, 
        prefix: (&[u8], Option<u8>)
    ) -> bool;

    pub fn insert(
        &mut self, 
        prefix: (&[u8], Option<u8>), 
        value: &[u8]
    ) -> <H as Hasher>::Out;

    pub fn emplace(
        &mut self, 
        key: <H as Hasher>::Out, 
        prefix: (&[u8], Option<u8>), 
        value: T
    );

    pub fn remove(
        &mut self, 
        key: &<H as Hasher>::Out, 
        prefix: (&[u8], Option<u8>)
    );
}

Trait modelling datastore keyed by a hash defined by the Hasher.

Required methods

pub fn get(
    &self,
    key: &<H as Hasher>::Out,
    prefix: (&[u8], Option<u8>)
) -> Option<T>[src]

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

pub fn contains(
    &self,
    key: &<H as Hasher>::Out,
    prefix: (&[u8], Option<u8>)
) -> bool[src]

Check for the existance of a hash-key.

pub fn insert(
    &mut self,
    prefix: (&[u8], Option<u8>),
    value: &[u8]
) -> <H as Hasher>::Out[src]

Insert a datum item into the DB and return the datum’s hash for a later lookup. Insertions are counted and the equivalent number of remove()s must be performed before the data is considered dead.

pub fn emplace(
    &mut self,
    key: <H as Hasher>::Out,
    prefix: (&[u8], Option<u8>),
    value: T
)[src]

Like insert(), except you provide the key and the data is all moved.

pub fn remove(&mut self, key: &<H as Hasher>::Out, prefix: (&[u8], Option<u8>))[src]

Remove a datum previously inserted. Insertions can be “owed” such that the same number of insert()s may happen without the data being eventually being inserted into the DB. It can be “owed” more than once.

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Trait Implementations

impl<'a, H, T> AsHashDB<H, T> for &'a mut (dyn HashDB<H, T> + 'a) where
    H: Hasher, [src]

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

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

Implementors

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