Trait StorageIterator 

pub trait StorageIterator<H>
where
    H: Hasher,
{
    type Backend;
    type Error;

    // Required methods
    fn next_key(
        &mut self,
        backend: &Self::Backend,
    ) -> Option<Result<StorageKey, Self::Error>>;
    fn next_pair(
        &mut self,
        backend: &Self::Backend,
    ) -> Option<Result<(StorageKey, StorageValue), Self::Error>>;
    fn was_complete(&self) -> bool;
}

A trait for a raw storage iterator.

Required Associated Types

type Backend

The state backend over which the iterator is iterating.

type Error

The error type.

Required Methods

fn next_key( &mut self, backend: &Self::Backend, ) -> Option<Result<StorageKey, Self::Error>>

Fetches the next key from the storage.

fn next_pair( &mut self, backend: &Self::Backend, ) -> Option<Result<(StorageKey, StorageValue), Self::Error>>

Fetches the next key and value from the storage.

fn was_complete(&self) -> bool

Returns whether the end of iteration was reached without an error.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors