c++ - 使自己的随机数类与 uniform_int_distribution 兼容

Question

我创建了一个实现 MersenneTwister 算法以生成伪随机数的类。我的问题是如何让我的生成器使用默认的 std::uniform_int_distribution？我类(class)的标题如下:

class MersenneTwister
{
public:
    void initialize(unsigned int seed);
    unsigned int extract();

private:
    unsigned int twist();
    unsigned int _x[624];
    signed int _index;
};

Answer 1

建模 UniformRandomBitGenerator 概念应该做到这一点:

http://en.cppreference.com/w/cpp/concept/UniformRandomBitGenerator

像这样:

#include <limits>

class MersenneTwister
{
public:
    void initialize(unsigned int seed);
    unsigned int extract();

    //
    // model the concept here
    //

    using result_type = unsigned int;
    static constexpr result_type min() { return std::numeric_limits<result_type>::min(); }
    static constexpr result_type max() { return std::numeric_limits<result_type>::max(); }
    result_type operator()()
    {
        return extract();
    }

private:
    unsigned int twist();
    unsigned int _x[624];
    signed int _index;
};