C++ 数值库:std::uniform_int_distribution<>，更改调用之间的分布范围

Question

我有类似下面的代码:

    vector<int> vec;
    // stuff vector here

    random_device rd;
    minstd_rand generator(rd());
    uniform_int_distribution<unsigned> dist(0 , vec.size() - 1);
    while (vec.size() > 0)
    {
       auto it = vec.begin() + dist(generator);
       // use *it for something
       swap(*it, *(vec.end() - 1));
       vec.pop_back();
   }

我知道我可以在循环内构造/破坏局部分布。但我宁愿只调整循环内 dist 的边界。我可以这样做吗？

Answer 1

param呢？ ？

dist.param( decltype(dist)::param_type(otherMin, otherMax) );

C++11 标准(及后续标准)，[rand.req.dist]/9:

For each of the constructors of D taking arguments corresponding to parameters of the distribution, P shall have a corresponding constructor subject to the same requirements and taking arguments identical in number, type, and default values.