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));
    require(_to != address(0));
    
    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.
 */