Strings.sol 中少部署了一個方法

[LonYui]

在 master 有此方法，但是實際上inport沒有

💻 Environment Truffle remix ide

📝 Details

TypeError: Member "equal" not found or not visible after argument-dependent lookup in type(library Strings).
  --> project:/contracts/CRUD.sol:35:17:
   |
35 |             if (Strings.equal(arr[i],searchFor)) {
   |                 ^^^^^^^^^^^^^

sol

pragma solidity 0.8.7;
import "@openzeppelin/contracts/utils/Strings.sol";

contract CRUD {
    struct User {
        string account;
        string password;
        uint status;
        uint createdAt;
        uint updatedAt;
    }

    mapping (string => User) public users;
    string[] public accounts;

    function createUser(string memory _account, string memory _password, uint _status) public {
        users[_account] = User(_account, _password, _status, block.timestamp, block.timestamp);
        accounts.push(_account);
    }

    function updateUser(string memory _account, string memory _password, uint _status) public {
        users[_account].password = _password;
        users[_account].status = _status;
        users[_account].updatedAt = block.timestamp;
    }

    function deleteUser(string memory _account) public {
        delete users[_account];
        delete accounts[indexOf(accounts,_account)];
    }

    function indexOf(string[] memory arr, string memory searchFor) private returns (uint256) {
        for (uint256 i = 0; i < arr.length; i++) {
//            if (arr[i] == searchFor) {
            if (Strings.equal(arr[i],searchFor)) {
                return i;
            }
        }
        return 2^256 -1; // not found
    }
}

🔢 Code to reproduce bug truffle compile remix compile

[Amxx]

Hello @LonYui

Strings.equal is in master but is has not yet been released. It will be a new feature in 4.9.