Enum trie_db::CachedValue

pub enum CachedValue<H> {
    NonExisting,
    ExistingHash(H),
    Existing {
        hash: H,
        data: BytesWeak,
    },
}

A value as cached by the TrieCache.

Variants

NonExisting

The value doesn’t exist in the trie.

ExistingHash(H)

We cached the hash, because we did not yet accessed the data.

Existing

Fields

hash: H

The hash of the value.

data: BytesWeak

The actual data of the value stored as BytesWeak.

The original data Bytes is stored in the trie node that is also cached by the TrieCache. If this node is dropped, this data will also not be “upgradeable” anymore.

The value exists in the trie.

Implementations

impl<H: Copy> CachedValue<H>

pub fn data(&self) -> Option<Option<Bytes>>

Returns the data of the value.

If a value doesn’t exist in the trie or only the value hash is cached, this function returns None. If the reference to the data couldn’t be upgraded (see [Bytes::upgrade]), this function returns Some(None), aka the data needs to be fetched again from the trie.

pub fn hash(&self) -> Option<H>

Returns the hash of the value.

Returns only None when the value doesn’t exist.

Trait Implementations

impl<H: Clone> Clone for CachedValue<H>

fn clone(&self) -> CachedValue<H>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<H: Debug> Debug for CachedValue<H>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<H> From<(Bytes, H)> for CachedValue<H>

fn from(value: (Bytes, H)) -> Self

Converts to this type from the input type.

impl<H> From<H> for CachedValue<H>

fn from(value: H) -> Self

Converts to this type from the input type.

impl<H> From<Option<(Bytes, H)>> for CachedValue<H>

fn from(value: Option<(Bytes, H)>) -> Self

Converts to this type from the input type.

impl<H> From<Option<H>> for CachedValue<H>

fn from(value: Option<H>) -> Self

Converts to this type from the input type.