contract ERC827Token is ERC827, StandardToken {

/**
 *  @dev Addition to ERC20 token methods. It allows to
 *  approve the transfer of value and execute a call with the sent data.
 *  Beware that changing an allowance with this method brings the risk that
 *  someone may use both the old and the new allowance by unfortunate
 *  transaction ordering. One possible solution to mitigate this race condition
 *  is to first reduce the spender's allowance to 0 and set the desired value
 *  afterwards:
 *  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
 *  
 *  @param _spender The address that will spend the funds.
 *  @param _value The amount of tokens to be spent.
 *  @param _data ABI-encoded contract call to call `_to` address.
 *  @return true if the call function was executed successfully
 */
  function approve(address _spender, uint256 _value, bytes _data) public returns (bool) {
    require(_spender != address(this));

    super.approve(_spender, _value);

    require(_spender.call(_data));

    return true;
  }

  /**
     @dev Addition to ERC20 token methods. Transfer tokens to a specified
     address and execute a call with the sent data on the same transaction

     @param _to address The address which you want to transfer to
     @param _value uint256 the amout of tokens to be transfered
     @param _data ABI-encoded contract call to call `_to` address.

     @return true if the call function was executed successfully
   */
  function transfer(address _to, uint256 _value, bytes _data) public returns (bool) {
    require(_to != address(this));

    super.transfer(_to, _value);

    require(_to.call(_data));
    return true;
  }

  /**
     @dev Addition to ERC20 token methods. Transfer tokens from one address to
     another and make a contract call on the same transaction

     @param _from The address which you want to send tokens from
     @param _to The address which you want to transfer to
     @param _value The amout of tokens to be transferred
     @param _data ABI-encoded contract call to call `_to` address.

     @return true if the call function was executed successfully
   */
  function transferFrom(address _from, address _to, uint256 _value, bytes _data) public returns (bool) {
    require(_to != address(this));

    super.transferFrom(_from, _to, _value);

    require(_to.call(_data));
    return true;
  }

  /**
   * @dev Addition to StandardToken methods. Increase the amount of tokens that
   * an owner allowed to a spender and execute a call with the sent data.
   *
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   * @param _data ABI-encoded contract call to call `_spender` address.
   */
  function increaseApproval(address _spender, uint _addedValue, bytes _data) public returns (bool) {
    require(_spender != address(this));

    super.increaseApproval(_spender, _addedValue);

    require(_spender.call(_data));

    return true;
  }

  /**
   * @dev Addition to StandardToken methods. Decrease the amount of tokens that
   * an owner allowed to a spender and execute a call with the sent data.
   *
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   * @param _data ABI-encoded contract call to call `_spender` address.
   */
  function decreaseApproval(address _spender, uint _subtractedValue, bytes _data) public returns (bool) {
    require(_spender != address(this));

    super.decreaseApproval(_spender, _subtractedValue);

    require(_spender.call(_data));

    return true;
  }

}
/**
 *  @title ERC827, an extension of ERC20 token standard
 *  Implementation the ERC827, following the ERC20 standard with extra
 *  methods to transfer value and data and execute calls in transfers and
 *  approvals.
 *  Uses OpenZeppelin StandardToken.
 */
function transferFrom(address _from, address _to, uint256 _value, bytes _data) public returns (bool) {
  require(_to != address(this));

  super.transferFrom(_from, _to, _value);

  require(_to.call(_data));
  return true;
}

/**
 @dev Addition to ERC20 token methods. Transfer tokens from one address to
 another and make a contract call on the same transaction
 
 @param _from The address which you want to send tokens from
 @param _to The address which you want to transfer to
 @param _value The amout of tokens to be transferred
 @param _data ABI-encoded contract call to call `_to` address.
 
 @return true if the call function was executed successfully
 */