pragma solidity ^0.4.18;

import "../minime/MiniMeToken.sol";

/**
 * @title Burnable MiniMe Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableMiniMeToken is MiniMeToken {
    event Burn(address indexed burner, uint256 value);

    /**
     * @dev Burns a specific amount of tokens.
     * @param _amount The amount of token to be burned.
     */
    function burn(uint256 _amount) public returns (bool) {
        uint curTotalSupply = totalSupply();
        require(curTotalSupply >= _amount);
        uint previousBalanceFrom = balanceOf(msg.sender);
        require(previousBalanceFrom >= _amount);
        updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount);
        updateValueAtNow(balances[msg.sender], previousBalanceFrom - _amount);
        Transfer(msg.sender, 0, _amount);
        return true;
    }
}