[−][src]Trait reference_trie::TrieMut

pub trait TrieMut<H, C> where
    C: NodeCodec<H>,
    H: Hasher, {
    fn root(&mut self) -> &<H as Hasher>::Out;

    fn is_empty(&self) -> bool;

    fn get<'a, 'key>(
        &'a self, 
        key: &'key [u8]
    ) -> Result<Option<ElasticArray128<u8>>, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>
    where
        'a: 'key;

    fn insert(
        &mut self, 
        key: &[u8], 
        value: &[u8]
    ) -> Result<Option<ElasticArray128<u8>>, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>;

    fn remove(
        &mut self, 
        key: &[u8]
    ) -> Result<Option<ElasticArray128<u8>>, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>;

    fn contains(
        &self, 
        key: &[u8]
    ) -> Result<bool, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>> { ... }
}

A key-value datastore implemented as a database-backed modified Merkle tree.

Required methods

fn root(&mut self) -> &<H as Hasher>::Out

Return the root of the trie.

fn is_empty(&self) -> bool

Is the trie empty?

fn get<'a, 'key>(
    &'a self,
    key: &'key [u8]
) -> Result<Option<ElasticArray128<u8>>, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>> where
    'a: 'key, 

What is the value of the given key in this trie?

fn insert(
    &mut self,
    key: &[u8],
    value: &[u8]
) -> Result<Option<ElasticArray128<u8>>, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>

Insert a key/value pair into the trie. An empty value is equivalent to removing key from the trie. Returns the old value associated with this key, if it existed.

fn remove(
    &mut self,
    key: &[u8]
) -> Result<Option<ElasticArray128<u8>>, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>

Remove a key from the trie. Equivalent to making it equal to the empty value. Returns the old value associated with this key, if it existed.

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Provided methods

fn contains(
    &self,
    key: &[u8]
) -> Result<bool, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>

Does the trie contain a given key?

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Implementations on Foreign Types

impl<'db, H, C> TrieMut<H, C> for SecTrieDBMut<'db, H, C> where
    C: NodeCodec<H>,
    H: Hasher, 
[src]

impl<'db, H, C> TrieMut<H, C> for FatDBMut<'db, H, C> where
    C: NodeCodec<H>,
    H: Hasher, 
[src]

impl<'a, H, C> TrieMut<H, C> for TrieDBMut<'a, H, C> where
    C: NodeCodec<H>,
    H: Hasher, 
[src]

fn contains(
    &self,
    key: &[u8]
) -> Result<bool, Box<TrieError<<H as Hasher>::Out, <C as NodeCodec<H>>::Error>>>
[src]

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Implementors

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