contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  /**
   * 账户总余额
   * */
  mapping(address => uint256) balances;

  /**
   * 总供应量
   * */
  uint256 totalSupply_;

  /**
   * 获取总供应量
   * */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

}
function totalSupply() public view returns (uint256) {
  return totalSupply_;
}

/**
 * 获取总供应量
 * */