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wjmelements/Sponsored v1

Last active March 10, 2018 08:03
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Sponsored gas plugin
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Sponsored v1
pragma solidity^0.4.19;
// like a less-liquid GasToken
contract Sponsored {
uint256[] wastedSpace;
function sponsor() external {
uint256 len = wastedSpace.length;
wastedSpace.length = len + 5;
wastedSpace[len] = 1;
wastedSpace[len+1] = 1;
wastedSpace[len+2] = 1;
wastedSpace[len+3] = 1;
wastedSpace[len+4] = 1;
}
modifier sponsored {
_;
uint256 len = wastedSpace.length;
if (len != 0) {
wastedSpace[--len] = 0;
wastedSpace[--len] = 0;
wastedSpace[--len] = 0;
wastedSpace[--len] = 0;
wastedSpace[--len] = 0;
wastedSpace.length = len;
}
}
}
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How to use:

contract Dapp is Sponsored {
    function action(/* */) external sponsored {
        /* */
    }
}

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