Trait fuel_core_storage::Mappable
pub trait Mappable {
type Key: ToOwned + ?Sized;
type OwnedKey: From<<Self::Key as ToOwned>::Owned> + Clone;
type Value: ToOwned + ?Sized;
type OwnedValue: From<<Self::Value as ToOwned>::Owned> + Clone;
}Expand description
Mappable type with Key and Value.
Example
use fuel_storage::Mappable;
pub struct Contract;
impl Mappable for Contract {
/// The `[u8; 32]` is a primitive type, so we can't optimize it more.
type Key = Self::OwnedKey;
type OwnedKey = [u8; 32];
/// It is optimized to use slice instead of vector.
type Value = [u8];
type OwnedValue = Vec<u8>;
}Required Associated Types§
type Key: ToOwned + ?Sized
type Key: ToOwned + ?Sized
The key type is used during interaction with the storage. In most cases, it is the same
as Self::OwnedKey.
type OwnedKey: From<<Self::Key as ToOwned>::Owned> + Clone
type OwnedKey: From<<Self::Key as ToOwned>::Owned> + Clone
The owned type of the Key retrieving from the storage.