pragma solidity >=0.4.24;

/**
IExtendedERC20 对ERC20标准扩展的一个接口定义
 */
interface IExtendedERC20 {
  function name() external view returns (string memory);

  function symbol() external view returns (string memory);

  function decimals() external view returns (uint8);

  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external
    view
    returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value) external returns (bool);

  function transferFrom(
    address from,
    address to,
    uint256 value
  ) external returns (bool);

  function increaseAllowance(address spender, uint256 addedValue)
    external
    returns (bool);

  function decreaseAllowance(address spender, uint256 subtractedValue)
    external
    returns (bool);

  function mint(address account, uint256 value) external returns (bool);

  function burn(address account, uint256 value) external returns (bool);

  event Transfer(address indexed from, address indexed to, uint256 value);

  event Approval(address indexed owner, address indexed spender, uint256 value);

  event Mint(address indexed account, uint256 value);

  event Burn(address indexed account, uint256 value);
}