contract OwnableOperatorRole is Ownable, OperatorRole {
    /**
     * @dev Makes the address an operator. Only owner can call this function.
     */
    function addOperator(address account) public onlyOwner {
        _addOperator(account);
    }

    /**
     * @dev Removes the address from operators. Only owner can call this function.
     */
    function removeOperator(address account) public onlyOwner {
        _removeOperator(account);
    }
}
/**
 * @title OwnableOperatorRole
 * @dev Allows owner to add and remove operators.
 */
function addOperator(address account) public onlyOwner {
    _addOperator(account);
}

/**
 * @dev Makes the address an operator. Only owner can call this function.
 */