openzeppelin-contracts/contracts/token/ERC20/ERC20Burnable.sol

pragma solidity ^0.4.24;

import "./ERC20.sol";


/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract ERC20Burnable is ERC20 {

  event TokensBurned(address indexed burner, uint256 value);

  /**
   * @dev Burns a specific amount of tokens.
   * @param value The amount of token to be burned.
   */
  function burn(uint256 value) public {
    _burn(msg.sender, value);
  }

  /**
   * @dev Burns a specific amount of tokens from the target address and decrements allowance
   * @param from address The address which you want to send tokens from
   * @param value uint256 The amount of token to be burned
   */
  function burnFrom(address from, uint256 value) public {
    _burnFrom(from, value);
  }

  /**
   * @dev Overrides ERC20._burn in order for burn and burnFrom to emit
   * an additional Burn event.
   */
  function _burn(address who, uint256 value) internal {
    super._burn(who, value);
    emit TokensBurned(who, value);
  }
}