Trait Mapping

pub trait Mapping {
    type Key: Asm;
    type Value: StorageValue;

    const STORAGE_SLOT: i32;

    // Required method
    fn storage_key(key: Self::Key) -> [u8; 32];

    // Provided methods
    fn get(key: Self::Key) -> Self::Value { ... }
    fn set(key: Self::Key, value: Self::Value) { ... }
}

Storage mapping interface

Required Associated Constants

const STORAGE_SLOT: i32

Required Associated Types

type Key: Asm

type Value: StorageValue

Required Methods

fn storage_key(key: Self::Key) -> [u8; 32]

Provided Methods

fn get(key: Self::Key) -> Self::Value

Get value from storage key.

fn set(key: Self::Key, value: Self::Value)

Set key and value

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors