contract BasicToken is ERC20Basic {
    using SafeMath for uint256;
    IterableMapping.itmap balances;

    uint256 internal totalSupply_;

    /**
  * @dev Total number of tokens in existence
  */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
  * @dev Transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(
            _value <= IterableMapping.iterate_getValue(balances, msg.sender),
            "not enough balances"
        );
        require(_to != address(0), "0 address not allow");

        IterableMapping.insert(
            balances,
            msg.sender,
            IterableMapping.iterate_getValue(balances, msg.sender).sub(_value)
        );
        IterableMapping.insert(
            balances,
            _to,
            IterableMapping.iterate_getValue(balances, _to).add(_value)
        );
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
    function balanceOf(address _owner) public view returns (uint256) {
        return IterableMapping.iterate_getValue(balances, _owner);
    }

}
/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
function balanceOf(address _owner) public view returns (uint256) {
    return IterableMapping.iterate_getValue(balances, _owner);
}

/**
 * @dev Gets the balance of the specified address.
 * @param _owner The address to query the the balance of.
 * @return An uint256 representing the amount owned by the passed address.
 */