Trait ChangesTrieStorage 

pub trait ChangesTrieStorage<H: Hasher, Number: BlockNumber>: RootsStorage<H, Number> {
    // Required methods
    fn as_roots_storage(&self) -> &dyn RootsStorage<H, Number>;
    fn with_cached_changed_keys(
        &self,
        root: &H::Out,
        functor: &mut dyn FnMut(&HashMap<Option<PrefixedStorageKey>, HashSet<StorageKey>>),
    ) -> bool;
    fn get(
        &self,
        key: &H::Out,
        prefix: Prefix<'_>,
    ) -> Result<Option<DBValue>, String>;
}

Changes trie storage. Provides access to trie roots and trie nodes.

Required Methods

fn as_roots_storage(&self) -> &dyn RootsStorage<H, Number>

Casts from self reference to RootsStorage reference.

fn with_cached_changed_keys( &self, root: &H::Out, functor: &mut dyn FnMut(&HashMap<Option<PrefixedStorageKey>, HashSet<StorageKey>>), ) -> bool

Execute given functor with cached entry for given trie root. Returns true if the functor has been called (cache entry exists) and false otherwise.

fn get( &self, key: &H::Out, prefix: Prefix<'_>, ) -> Result<Option<DBValue>, String>

Get a trie node.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<H: Hasher, Number: BlockNumber> Storage<H, Number> for InMemoryStorage<H, Number>