Trait fuel_storage::Mappable

pub trait Mappable {
    type Key;
    type SetValue: ?Sized;
    type GetValue: Clone;
}

Mappable type with Key and Value.

Required Associated Types

type Key

The type of the value’s key.

type SetValue: ?Sized

The value type is used while setting the value to the storage. In most cases, it is the same as Self::GetValue, but it is without restriction and can be used for performance optimizations.

Example

use core::marker::PhantomData;
use fuel_storage::Mappable;
pub struct Contract<'a>(PhantomData<&'a ()>);

impl<'a> Mappable for Contract<'a> {
    type Key = &'a [u8; 32];
    /// It is optimized to use slice instead of vector.
    type SetValue = [u8];
    type GetValue = Vec<u8>;
}

type GetValue: Clone

The value type is used while getting the value from the storage.

Implementors