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TrieMut

sp_state_machine

Trait TrieMut 

Source 
pub trait TrieMut<L>
where
    L: TrieLayout,
{
    // Required methods
    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<Value<L>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::Error>>>;
    fn remove(
        &mut self,
        key: &[u8],
    ) -> Result<Option<Value<L>>, Box<TrieError<<<L as TrieLayout>::Hash as Hasher>::Out, <<L as TrieLayout>::Codec as NodeCodec>::Error>>>;

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

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

Required Methods§

Source

fn root(&mut self) -> &<<L as TrieLayout>::Hash as Hasher>::Out

Return the root of the trie.

Source

fn is_empty(&self) -> bool

Is the trie empty?

Source

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?

Source

fn insert( &mut self, key: &[u8], value: &[u8], ) -> Result<Option<Value<L>>, 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.

Source

fn remove( &mut self, key: &[u8], ) -> Result<Option<Value<L>>, 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.

Provided Methods§

Source

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?

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§

Source§

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

Source§

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

Source§

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