Enum trie_db::CachedValue

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

A value as cached by the TrieCache.

Variants§

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NonExisting

The value doesn’t exist in the trie.

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ExistingHash(H)

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

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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.

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impl<H: Copy> CachedValue<H>

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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.

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

Returns the hash of the value.

Returns only None when the value doesn’t exist.

Trait Implementations§

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

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<H: Debug> Debug for CachedValue<H>

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

Formats the value using the given formatter. Read more
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impl<H> From<(Bytes, H)> for CachedValue<H>

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

Converts to this type from the input type.
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impl<H> From<H> for CachedValue<H>

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fn from(value: H) -> Self

Converts to this type from the input type.
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impl<H> From<Option<(Bytes, H)>> for CachedValue<H>

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

Converts to this type from the input type.
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impl<H> From<Option<H>> for CachedValue<H>

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

Converts to this type from the input type.

Auto Trait Implementations§

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impl<H> RefUnwindSafe for CachedValue<H>where H: RefUnwindSafe,

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impl<H> Send for CachedValue<H>where H: Send,

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impl<H> Sync for CachedValue<H>where H: Sync,

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impl<H> Unpin for CachedValue<H>where H: Unpin,

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impl<H> UnwindSafe for CachedValue<H>where H: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<!> for T

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fn from(t: !) -> T

Converts to this type from the input type.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> MaybeDebug for Twhere T: Debug,