Trait StorageDoubleMap 

pub trait StorageDoubleMap {
    type KEY1: Decode + Encode;
    type KEY2: Decode + Encode;
    type VALUE: Decode;

    const PALLET_NAME: &'static str;
    const STORAGE_NAME: &'static str;
    const KEY1_HASHER: StorageHasher;
    const KEY2_HASHER: StorageHasher;

    // Provided methods
    fn encode_partial_key(key1: &Self::KEY1) -> Vec<u8>  { ... }
    fn hex_encode_partial_key(key1: &Self::KEY1) -> String { ... }
    fn encode_storage_key(key1: &Self::KEY1, key2: &Self::KEY2) -> Vec<u8>  { ... }
    fn hex_encode_storage_key(key1: &Self::KEY1, key2: &Self::KEY2) -> String { ... }
    fn decode_partial_key(value: &mut &[u8]) -> Result<Self::KEY1, Error> { ... }
    fn decode_hex_storage_key(
        value: &str,
    ) -> Result<(Self::KEY1, Self::KEY2), Error> { ... }
    fn decode_storage_key(
        value: &mut &[u8],
    ) -> Result<(Self::KEY1, Self::KEY2), Error> { ... }
    fn decode_hex_storage_value(value: &str) -> Result<Self::VALUE, Error> { ... }
    fn decode_storage_value(value: &mut &[u8]) -> Result<Self::VALUE, Error> { ... }
    fn fetch(
        client: &RpcClient,
        key_1: &Self::KEY1,
        key_2: &Self::KEY2,
        at: Option<H256>,
    ) -> impl Future<Output = Result<Option<Self::VALUE>, Error>> { ... }
    fn iter(
        client: RpcClient,
        key_1: &Self::KEY1,
        block_hash: H256,
    ) -> StorageDoubleMapIterator<Self>
       where Self: Sized { ... }
}

Required Associated Constants

const PALLET_NAME: &'static str

const STORAGE_NAME: &'static str

const KEY1_HASHER: StorageHasher

const KEY2_HASHER: StorageHasher

Required Associated Types

type KEY1: Decode + Encode

type KEY2: Decode + Encode

type VALUE: Decode

Provided Methods

fn encode_partial_key(key1: &Self::KEY1) -> Vec<u8>

fn hex_encode_partial_key(key1: &Self::KEY1) -> String

fn encode_storage_key(key1: &Self::KEY1, key2: &Self::KEY2) -> Vec<u8>

fn hex_encode_storage_key(key1: &Self::KEY1, key2: &Self::KEY2) -> String

fn decode_partial_key(value: &mut &[u8]) -> Result<Self::KEY1, Error>

fn decode_hex_storage_key( value: &str, ) -> Result<(Self::KEY1, Self::KEY2), Error>

Decodes the Hex and SCALE encoded Storage Key This is equal to Hex::decode + Self::decode_storage_key

If you need to decode bytes call decode_storage_key

fn decode_storage_key( value: &mut &[u8], ) -> Result<(Self::KEY1, Self::KEY2), Error>

Decodes the SCALE encoded Storage Key

If you need to decode Hex string call decode_hex_storage_key

fn decode_hex_storage_value(value: &str) -> Result<Self::VALUE, Error>

Decodes the Hex and SCALE encoded Storage Value This is equal to Hex::decode + Self::decode_storage_value

If you need to decode bytes call decode_storage_value

fn decode_storage_value(value: &mut &[u8]) -> Result<Self::VALUE, Error>

Decodes the SCALE encoded Storage Value

If you need to decode Hex string call decode_hex_storage_value

fn fetch( client: &RpcClient, key_1: &Self::KEY1, key_2: &Self::KEY2, at: Option<H256>, ) -> impl Future<Output = Result<Option<Self::VALUE>, Error>>

Fetches and decodes a Storage Value

Returns None if no Storage Value is present

fn iter( client: RpcClient, key_1: &Self::KEY1, block_hash: H256, ) -> StorageDoubleMapIterator<Self>

where Self: Sized,

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