[−][src]Trait sp_state_machine::TrieMut

pub trait TrieMut<L> where
    L: TrieLayout, {
    fn root(&mut self) -> &<<L as TrieLayout>::Hash as Hasher>::Out;

    fn is_empty(&self) -> bool;

    fn get<'a, 'key>(
        &'a self, 
        key: &'key [u8]
    ) -> Result<Option<Vec<u8>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::Error>>>
    where
        'a: 'key;

    fn insert(
        &mut self, 
        key: &[u8], 
        value: &[u8]
    ) -> Result<Option<Vec<u8>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::Error>>>;

    fn remove(
        &mut self, 
        key: &[u8]
    ) -> Result<Option<Vec<u8>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::Error>>>;

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

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

Required methods

fn root(&mut self) -> &<<L as TrieLayout>::Hash 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<Vec<u8>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::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<Vec<u8>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::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<Vec<u8>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::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<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::Error>>>

Does the trie contain a given key?

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Implementations on Foreign Types

impl<'db, L> TrieMut<L> for FatDBMut<'db, L> where
    L: TrieLayout, [src]

impl<'a, L> TrieMut<L> for TrieDBMut<'a, L> where
    L: TrieLayout, [src]

impl<'db, L> TrieMut<L> for SecTrieDBMut<'db, L> where
    L: TrieLayout, [src]

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Implementors

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