چیت‌شیت Solidity

1mapping(address => uint256) public credits;23function recordCredit(address account, uint256 amount) external {4    require(account != address(0), "zero address");5    credits[account] += amount;6}

1event OwnerChanged(address indexed previousOwner, address indexed newOwner);23function _setOwner(address newOwner) internal {4    address previous = owner;5    owner = newOwner;6    emit OwnerChanged(previous, newOwner);7}

1address public owner;23modifier onlyOwner() {4    require(msg.sender == owner, "not owner");5    _;6}78function pause() external onlyOwner {9    paused = true;10}

1error InvalidAmount(uint256 amount);23function deposit(uint256 amount) external payable {4    if (amount == 0) revert InvalidAmount(amount);5    require(msg.value == amount, "value mismatch");6    balances[msg.sender] += amount;7}

1function withdraw(uint256 amount) external {2    uint256 available = balances[msg.sender];3    require(amount > 0 && amount <= available, "invalid amount");45    balances[msg.sender] = available - amount;6    (bool sent, ) = payable(msg.sender).call{value: amount}("");7    require(sent, "transfer failed");8}

1(bool success, bytes memory returnData) = target.call(payload);2if (!success) {3    assembly {4        revert(add(returnData, 32), mload(returnData))5    }6}