Trait HashedCursor 

pub trait HashedCursor {
    type Value: Debug;

    // Required methods
    fn seek(
        &mut self,
        key: B256,
    ) -> Result<Option<(B256, Self::Value)>, DatabaseError>;
    fn next(&mut self) -> Result<Option<(B256, Self::Value)>, DatabaseError>;
    fn reset(&mut self);
}

The cursor for iterating over hashed entries.

Required Associated Types

type Value: Debug

Value returned by the cursor.

Required Methods

fn seek( &mut self, key: B256, ) -> Result<Option<(B256, Self::Value)>, DatabaseError>

Seek an entry greater than or equal to the given key and position the cursor there. Returns the first entry with the key greater than or equal to the sought key.

fn next(&mut self) -> Result<Option<(B256, Self::Value)>, DatabaseError>

Move the cursor to the next entry and return it.

fn reset(&mut self)

Reset the cursor to its initial state.

Important

After calling this method, the subsequent operation MUST be a HashedCursor::seek call.

Implementations on Foreign Types

impl<'a, T: 'a + HashedCursor + ?Sized> HashedCursor for &'a mut T

type Value = <T as HashedCursor>::Value

fn seek( &mut self, key: B256, ) -> Result<Option<(B256, Self::Value)>, DatabaseError>

fn next(&mut self) -> Result<Option<(B256, Self::Value)>, DatabaseError>

fn reset(&mut self)

Implementors

impl<'metrics, C> HashedCursor for InstrumentedHashedCursor<'metrics, C>

where C: HashedCursor,

type Value = <C as HashedCursor>::Value

impl<C, V> HashedCursor for HashedPostStateCursor<'_, C, V>

where C: HashedCursor<Value = V::NonZero>, V: HashedPostStateCursorValue,

type Value = <V as HashedPostStateCursorValue>::NonZero

impl<V> HashedCursor for NoopHashedCursor<V>

where V: Debug,

type Value = V