Stores all the parameters of the distribution.
struct param_type {
    typedef discrete_distribution<IntType> distribution_type;
    param_type();
    template<class Fn>
        param_type(size_t count,
            double low, double high, Fn func);
    std::vector<double> probabilities() const;
    bool operator==(const param_type& right) const;
    bool operator!=(const param_type& right) const;
    };
Remarks
This parameter package can be passed to operator() to generate the return value.
Requirements
Header: <random>
Namespace: std