Trait frame_support::storage::types::StorageDoubleMapMetadata

pub trait StorageDoubleMapMetadata {
    const MODIFIER: StorageEntryModifier;
    const NAME: &'static str;
    const DEFAULT: DefaultByteGetter;
    const HASHER1: StorageHasher;
    const HASHER2: StorageHasher;
}

Part of storage metadata for a storage double map.

NOTE: Generic hashers is supported.

Associated Constants

const MODIFIER: StorageEntryModifier

const NAME: &'static str

const DEFAULT: DefaultByteGetter

const HASHER1: StorageHasher

const HASHER2: StorageHasher

Implementors

impl<Prefix, Hasher1, Hasher2, Key1, Key2, Value, QueryKind, OnEmpty, MaxValues> StorageDoubleMapMetadata for StorageDoubleMap<Prefix, Hasher1, Key1, Hasher2, Key2, Value, QueryKind, OnEmpty, MaxValues> where
    Prefix: StorageInstance,
    Hasher1: StorageHasher,
    Hasher2: StorageHasher,
    Key1: FullCodec,
    Key2: FullCodec,
    Value: FullCodec,
    QueryKind: QueryKindTrait<Value, OnEmpty>,
    OnEmpty: Get<QueryKind::Query> + 'static,
    MaxValues: Get<Option<u32>>,