Overview
The StorageFactory contract allows you to create and manage multiple instances of the SimpleStorage contract. It maintains a list of deployed SimpleStorage contracts and provides functions to interact with them.
Contract Details
- License: MIT
- Solidity Version: 0.8.30
- Imports:
SimpleStorage from ./SimpleStorage.sol
State Variables
listOfSimpleStorageContracts
SimpleStorage[] public listOfSimpleStorageContracts
The index of the SimpleStorage contract in the array
Functions
createSimpleStorageContract
function createSimpleStorageContract() public
listOfSimpleStorageContracts array.
Visibility: public
State Mutability: Modifies state (deploys a new contract)
Description: This function deploys a new SimpleStorage contract using the new keyword and appends it to the internal list. Each call creates a fresh instance of SimpleStorage.
sfStore
function sfStore(uint256 _simpleStorageIndex, uint256 _newSimpleStorageNumber) public
public
State Mutability: Modifies state (updates storage in the target contract)
Parameters:
The index of the SimpleStorage contract in the listOfSimpleStorageContracts array
The number to store in the specified SimpleStorage contract
store() function on the SimpleStorage contract at the specified index, updating its stored value.
sfGet
function sfGet(uint256 _simpleStorageIndex) public view returns (uint256)
public
State Mutability: view (read-only)
Parameters:
The index of the SimpleStorage contract in the listOfSimpleStorageContracts array
uint256 - The favorite number stored in the specified SimpleStorage contract
Description: This function calls the retrieve() function on the SimpleStorage contract at the specified index and returns the stored value.
Complete Contract Code
// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;
import {SimpleStorage} from "./SimpleStorage.sol";
contract StorageFactory {
// type visibility name
SimpleStorage[] public listOfSimpleStorageContracts;
function createSimpleStorageContract() public {
SimpleStorage newSimpleStorageContract = new SimpleStorage();
listOfSimpleStorageContracts.push(newSimpleStorageContract);
}
function sfStore(uint256 _simpleStorageIndex, uint256 _newSimpleStorageNumber) public {
listOfSimpleStorageContracts[_simpleStorageIndex].store(_newSimpleStorageNumber);
}
function sfGet(uint256 _simpleStorageIndex) public view returns (uint256) {
return listOfSimpleStorageContracts[_simpleStorageIndex].retrieve();
}
}
Usage Examples
Creating and Using Storage Contracts
// Deploy the StorageFactory
StorageFactory factory = new StorageFactory();
// Create first SimpleStorage instance (index 0)
factory.createSimpleStorageContract();
// Create second SimpleStorage instance (index 1)
factory.createSimpleStorageContract();
// Store value in first contract
factory.sfStore(0, 42);
// Store value in second contract
factory.sfStore(1, 100);
// Retrieve values
uint256 firstValue = factory.sfGet(0); // Returns 42
uint256 secondValue = factory.sfGet(1); // Returns 100