Trait TrieCursor 

pub trait TrieCursor: Send + Sync {
    // Required methods
    fn seek_exact(
        &mut self,
        key: Nibbles,
    ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>;
    fn seek(
        &mut self,
        key: Nibbles,
    ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>;
    fn next(
        &mut self,
    ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>;
    fn current(&mut self) -> Result<Option<Nibbles>, DatabaseError>;
}

Available on crate feature trie only.

A cursor for traversing stored trie nodes. The cursor must iterate over keys in lexicographical order.

Required Methods

fn seek_exact( &mut self, key: Nibbles, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

Move the cursor to the key and return if it is an exact match.

fn seek( &mut self, key: Nibbles, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

Move the cursor to the key and return a value matching of greater than the key.

fn next( &mut self, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

Move the cursor to the next key.

fn current(&mut self) -> Result<Option<Nibbles>, DatabaseError>

Get the current entry.

Implementations on Foreign Types

impl<'a, T> TrieCursor for &'a mut T

where T: 'a + TrieCursor + ?Sized, &'a mut T: Send + Sync,

fn seek_exact( &mut self, key: Nibbles, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

fn seek( &mut self, key: Nibbles, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

fn next( &mut self, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

fn current(&mut self) -> Result<Option<Nibbles>, DatabaseError>

impl<T> TrieCursor for Box<T>

where T: TrieCursor + ?Sized, Box<T>: Send + Sync,

fn seek_exact( &mut self, key: Nibbles, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

fn seek( &mut self, key: Nibbles, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

fn next( &mut self, ) -> Result<Option<(Nibbles, BranchNodeCompact)>, DatabaseError>

fn current(&mut self) -> Result<Option<Nibbles>, DatabaseError>

Implementors

impl TrieCursor for NoopAccountTrieCursor

impl TrieCursor for NoopStorageTrieCursor

impl<C> TrieCursor for DatabaseAccountTrieCursor<C>

where C: DbCursorRO<AccountsTrie> + Send + Sync,

impl<C> TrieCursor for DatabaseStorageTrieCursor<C>

where C: DbCursorRO<StoragesTrie> + DbDupCursorRO<StoragesTrie> + Send + Sync,

impl<C> TrieCursor for InMemoryTrieCursor<'_, C>

where C: TrieCursor,