可公开的eos竞猜游戏随机算法（一）

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除了我之前提到的eosbet游戏合约中，使用的随机生成器；

接下来介绍另一个合约来实现随机生成器，废话不多说，直接贴代码

// Linear Congruential Generator
class random_gen {
private:
    static random_gen instance;

    const uint32_t a = 1103515245;
    const uint32_t c = 12345;
    uint64_t seed = 0;

public:
    static random_gen& get_instance(account_name player) {
        if (instance.seed == 0) {
            instance.seed = current_time() + player;
        }
        return instance;
    }

    uint32_t range(uint32_t to) {
        checksum256 result;
        sha256((char *)&seed, sizeof(seed), &result);
        seed = result.hash[1];
        seed <<= 32;
        seed |= result.hash[0];
        return (uint32_t)(seed % to);

        // old implementation
        // seed = (a * seed + c) % 0x7fffffff;
        // return (uint32_t)(seed % to);
    }
};

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