openzeppelin-contracts/contracts/token/ERC827.sol

pragma solidity ^0.4.13;

import "./ERC20.sol";

/**
   @title ERC827 interface, an extension of ERC20 token standard

   Interface of a ERC827 token, following the ERC20 standard with extra
   methods to transfer value and data and execute calls in transfers and
   approvals.
 */
contract ERC827 is ERC20 {

  function approve(
    address _spender, uint256 _value, bytes _data
  ) public returns (bool);

  function transfer(
    address _to, uint256 _value, bytes _data
  ) public returns (bool);

  function transferFrom(
    address _from, address _to, uint256 _value, bytes _data
  ) public returns (bool);

}