Struct frame_support::storage::types::Key

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pub struct Key<Hasher, KeyType>(_);

Expand description

A type used exclusively by storage maps as their key type.

The final key generated has the following form:

Hasher1(encode(key1))
    ++ Hasher2(encode(key2))
    ++ ...
    ++ HasherN(encode(keyN))

Trait Implementations

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impl<H: StorageHasher, K: FullCodec + StaticTypeInfo> KeyGenerator for Key<H, K>

type Key = K

type KArg = (K,)

type HashFn = Box<dyn FnOnce(&[u8]) -> Vec<u8, Global> + 'static, Global>

type HArg = (<Key<H, K> as KeyGenerator>::HashFn,)

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const HASHER_METADATA: &'static [StorageHasherIR] = _

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fn final_key<KArg: EncodeLikeTuple<Self::KArg> + TupleToEncodedIter>(
key: KArg
) -> Vec<u8> ⓘ

Given a key tuple, calculate the final key by encoding each element individually and hashing them using the corresponding hasher in the KeyGenerator. Read more

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fn migrate_key<KArg: EncodeLikeTuple<Self::KArg> + TupleToEncodedIter>(
key: &KArg,
hash_fns: Self::HArg
) -> Vec<u8> ⓘ

Given a key tuple, migrate the keys from using the old hashers as given by hash_fns to using the newer hashers as specified by this KeyGenerator. Read more

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impl<H: StorageHasher, K: FullCodec + MaxEncodedLen + StaticTypeInfo> KeyGeneratorMaxEncodedLen for Key<H, K>

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fn key_max_encoded_len() -> usize

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impl<H: ReversibleStorageHasher, K: FullCodec + StaticTypeInfo> ReversibleKeyGenerator for Key<H, K>

type ReversibleHasher = H

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fn decode_final_key(key_material: &[u8]) -> Result<(Self::Key, &[u8]), Error>

Auto Trait Implementations

impl<Hasher, KeyType> RefUnwindSafe for Key<Hasher, KeyType>where
Hasher: RefUnwindSafe,
KeyType: RefUnwindSafe,

impl<Hasher, KeyType> Send for Key<Hasher, KeyType>where
Hasher: Send,
KeyType: Send,

impl<Hasher, KeyType> Sync for Key<Hasher, KeyType>where
Hasher: Sync,
KeyType: Sync,

impl<Hasher, KeyType> Unpin for Key<Hasher, KeyType>where
Hasher: Unpin,
KeyType: Unpin,

impl<Hasher, KeyType> UnwindSafe for Key<Hasher, KeyType>where
Hasher: UnwindSafe,
KeyType: 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,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> CheckedConversion for T

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fn checked_from<T>(t: T) -> Option<Self>where
Self: TryFrom<T>,

Convert from a value of T into an equivalent instance of Option<Self>. Read more

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fn checked_into<T>(self) -> Option<T>where
Self: TryInto<T>,

Consume self to return Some equivalent value of Option<T>. Read more

impl<T> Downcast for Twhere
T: Any,

fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>

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

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

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

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

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

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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