Trait sp_trie::TrieMut

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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

Various re-exports from the trie-db crate. A key-value datastore implemented as a database-backed modified Merkle tree.

Required Methods§

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

Return the root of the trie.

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fn is_empty(&self) -> bool

Is the trie empty?

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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?

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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.

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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§

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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?

Implementors§

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

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

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