Struct sp_trie::KeySpacedDB

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pub struct KeySpacedDB<'a, DB, H>(_, _, _);

Expand description

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

Implementations

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impl<'a, DB, H> KeySpacedDB<'a, DB, H> where
H: Hasher,

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

instantiate new keyspaced db

Trait Implementations

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impl<'a, DB, H, T> HashDBRef<H, T> for KeySpacedDB<'a, DB, H> where
 DB: HashDBRef<H, T>,
 H: Hasher,
 T: From<&'static [u8 ]>,

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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. Read more

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fn contains(&self, key: &H::Out, prefix: Prefix<'_>) -> bool

Check for the existance of a hash-key.

Auto Trait Implementations

impl<'a, DB, H> RefUnwindSafe for KeySpacedDB<'a, DB, H> where
DB: RefUnwindSafe,
H: RefUnwindSafe,

impl<'a, DB, H> Send for KeySpacedDB<'a, DB, H> where
DB: Sync,
H: Send,

impl<'a, DB, H> Sync for KeySpacedDB<'a, DB, H> where
DB: Sync,
H: Sync,

impl<'a, DB, H> Unpin for KeySpacedDB<'a, DB, H> where
H: Unpin,

impl<'a, DB, H> UnwindSafe for KeySpacedDB<'a, DB, H> where
DB: RefUnwindSafe,
H: UnwindSafe,

Blanket Implementations

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

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pub fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> Downcast for T where
T: Any,

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pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘ
Notable traits for Box<W, Global>
`impl<W> Write for Box<W, Global> where W: Write + ?Sized, impl<R> Read for Box<R, Global> where R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where I: Iterator + ?Sized, A: Allocator, type Item = ::Item;impl<F, A> Future for Box<F, A> where F: Future + Unpin + ?Sized, A: Allocator + 'static, type Output = <F as Future>::Output;`

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait. Read more

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pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait. Read more

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pub fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s. Read more

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pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s. Read more

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impl<T> DowncastSync for T where
T: Any + Send + Sync,

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pub fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send + 'static>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait. Read more

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