29 lines
772 B
Solidity
29 lines
772 B
Solidity
pragma solidity ^0.4.18;
|
|
|
|
import "./BasicToken.sol";
|
|
|
|
|
|
/**
|
|
* @title Burnable Token
|
|
* @dev Token that can be irreversibly burned (destroyed).
|
|
*/
|
|
contract BurnableToken is BasicToken {
|
|
|
|
event Burn(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 {
|
|
require(_value <= balances[msg.sender]);
|
|
// no need to require value <= totalSupply, since that would imply the
|
|
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
|
|
|
|
address burner = msg.sender;
|
|
balances[burner] = balances[burner].sub(_value);
|
|
totalSupply_ = totalSupply_.sub(_value);
|
|
Burn(burner, _value);
|
|
}
|
|
}
|