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关于安全数学留空问题.

 2 years ago
source link: https://learnblockchain.cn/question/2642
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关于安全数学留空问题. | 登链社区 | 技术问答

关于安全数学留空问题. 

function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

我只想要c而不想要bool该怎么写来着？突然忘记了.


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