Skip to main content

Documentation Index

Fetch the complete documentation index at: https://docs.starknet.io/llms.txt

Use this file to discover all available pages before exploring further.

Provides direct write access to values in a storage Map. Enables directly storing values in the contract’s storage at the address of the given key.

​
Signature

pub trait StorageMapWriteAccess

​
Examples

use starknet::ContractAddress;
use starknet::storage::{Map, StorageMapWriteAccess, StoragePathEntry};

#[storage]
struct Storage {
    balances: Map,
    allowances: Map>,
}

fn write_storage(ref self: ContractState, address: ContractAddress) {
    // Write to single mapping
    self.balances.write(address, 100);
    // Write to nested mapping
    self.allowances.entry(owner).write(spender, 50);
}

​
Trait functions

​
write

​
Signature

fn write(self: TMemberState, key: Self::Key, value: Self::Value)

​
Trait types

​
Key

​
Signature

type Key;

​
Value

​
Signature

type Value;