Struct sp_trie::KeySpacedDBMut

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pub struct KeySpacedDBMut<'a, DB: ?Sized, H>(_, _, _);
Expand description

HashDBMut implementation that append a encoded prefix (unique id bytes) in addition to the prefix of every key value.

Mutable variant of KeySpacedDB, see KeySpacedDB.

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impl<'a, DB: ?Sized, H> KeySpacedDBMut<'a, DB, H>

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pub fn new(db: &'a mut DB, ks: &'a [u8]) -> Self

instantiate new keyspaced db

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impl<'a, DB, H, T> AsHashDB<H, T> for KeySpacedDBMut<'a, DB, H>where DB: HashDB<H, T>, H: Hasher, T: Default + PartialEq<T> + for<'b> From<&'b [u8]> + Clone + Send + Sync,

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fn as_hash_db(&self) -> &dyn HashDB<H, T>

Perform upcast to HashDB for anything that derives from HashDB.
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fn as_hash_db_mut<'b>(&'b mut self) -> &'b mut (dyn HashDB<H, T> + 'b)

Perform mutable upcast to HashDB for anything that derives from HashDB.
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impl<'a, DB, H, T> HashDB<H, T> for KeySpacedDBMut<'a, DB, H>where DB: HashDB<H, T>, H: Hasher, T: Default + PartialEq<T> + for<'b> From<&'b [u8]> + Clone + Send + Sync,

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fn get(&self, key: &H::Out, prefix: Prefix<'_>) -> Option<T>

Look up a given hash into the bytes that hash to it, returning None if the hash is not known.
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fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool

Check for the existence of a hash-key.
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fn insert(&mut self, prefix: Prefix<'_>, value: &[u8]) -> H::Out

Insert a datum item into the DB and return the datum’s hash for a later lookup. Insertions are counted and the equivalent number of remove()s must be performed before the data is considered dead.
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fn emplace(&mut self, key: H::Out, prefix: Prefix<'_>, value: T)

Like insert(), except you provide the key and the data is all moved.
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fn remove(&mut self, key: &H::Out, prefix: Prefix<'_>)

Remove a datum previously inserted. Insertions can be “owed” such that the same number of insert()s may happen without the data being eventually being inserted into the DB. It can be “owed” more than once.

Auto Trait Implementations§

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impl<'a, DB: ?Sized, H> RefUnwindSafe for KeySpacedDBMut<'a, DB, H>where DB: RefUnwindSafe, H: RefUnwindSafe,

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impl<'a, DB: ?Sized, H> Send for KeySpacedDBMut<'a, DB, H>where DB: Send, H: Send,

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impl<'a, DB: ?Sized, H> Sync for KeySpacedDBMut<'a, DB, H>where DB: Sync, H: Sync,

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impl<'a, DB: ?Sized, H> Unpin for KeySpacedDBMut<'a, DB, H>where H: Unpin,

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impl<'a, DB, H> !UnwindSafe for KeySpacedDBMut<'a, DB, H>

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<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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, Outer> IsWrappedBy<Outer> for Twhere Outer: AsRef<T> + AsMut<T> + From<T>, T: From<Outer>,

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fn from_ref(outer: &Outer) -> &T

Get a reference to the inner from the outer.

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fn from_mut(outer: &mut Outer) -> &mut T

Get a mutable reference to the inner from the outer.

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impl<T> Pointable for T

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const ALIGN: usize = mem::align_of::<T>()

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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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<S, T> UncheckedInto<T> for Swhere T: UncheckedFrom<S>,

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fn unchecked_into(self) -> T

The counterpart to unchecked_from.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<H, T> AsHashDB<H> for Twhere H: Hasher, T: AsHashDB<H, Vec<u8, Global>>,

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impl<T> JsonSchemaMaybe for T

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impl<T> MaybeRefUnwindSafe for Twhere T: RefUnwindSafe,