#pragma once

#include <cstdint>
#include <random>

class xorshift32
{
public:
    explicit xorshift32(uint32_t seed = std::random_device{}())
        : state(seed ? seed : 0x9e3779b9u)
    {
    }

    uint32_t operator()()
    {
        state ^= state << 13;
        state ^= state >> 17;
        state ^= state << 5;
        return state;
    }

private:
    uint32_t state;
};