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28 lines
846 B
28 lines
846 B
pragma solidity ^0.4.13;
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import './StandardToken.sol';
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/**
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* @title Burnable Token
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* @dev Token that can be irreversibly burned (destroyed).
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*/
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contract BurnableToken is StandardToken {
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event Burn(address indexed burner, uint256 value);
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/**
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* @dev Burns a specific amount of tokens.
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* @param _value The amount of token to be burned.
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*/
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function burn(uint256 _value) public {
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require(_value > 0);
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require(_value <= balances[msg.sender]);
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// no need to require value <= totalSupply, since that would imply the
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// sender's balance is greater than the totalSupply, which *should* be an assertion failure
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address burner = msg.sender;
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balances[burner] = balances[burner].sub(_value);
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totalSupply = totalSupply.sub(_value);
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Burn(burner, _value);
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}
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}
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