old/xorshift.inc.cpp

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• Last update: 2020-01-08 18:35:19+09:00

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class xor_shift_128 {
public:
    typedef uint32_t result_type;
    xor_shift_128(uint32_t seed = 42) {
        set_seed(seed);
    }
    void set_seed(uint32_t seed) {
        a = seed = 1812433253u * (seed ^ (seed >> 30));
        b = seed = 1812433253u * (seed ^ (seed >> 30)) + 1;
        c = seed = 1812433253u * (seed ^ (seed >> 30)) + 2;
        d = seed = 1812433253u * (seed ^ (seed >> 30)) + 3;
    }
    uint32_t operator() () {
        uint32_t t = (a ^ (a << 11));
        a = b; b = c; c = d;
        return d = (d ^ (d >> 19)) ^ (t ^ (t >> 8));
    }
    static constexpr uint32_t max() { return numeric_limits<result_type>::max(); }
    static constexpr uint32_t min() { return numeric_limits<result_type>::min(); }
private:
    uint32_t a, b, c, d;
};

#line 1 "old/xorshift.inc.cpp"
class xor_shift_128 {
public:
    typedef uint32_t result_type;
    xor_shift_128(uint32_t seed = 42) {
        set_seed(seed);
    }
    void set_seed(uint32_t seed) {
        a = seed = 1812433253u * (seed ^ (seed >> 30));
        b = seed = 1812433253u * (seed ^ (seed >> 30)) + 1;
        c = seed = 1812433253u * (seed ^ (seed >> 30)) + 2;
        d = seed = 1812433253u * (seed ^ (seed >> 30)) + 3;
    }
    uint32_t operator() () {
        uint32_t t = (a ^ (a << 11));
        a = b; b = c; c = d;
        return d = (d ^ (d >> 19)) ^ (t ^ (t >> 8));
    }
    static constexpr uint32_t max() { return numeric_limits<result_type>::max(); }
    static constexpr uint32_t min() { return numeric_limits<result_type>::min(); }
private:
    uint32_t a, b, c, d;
};

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