Stores the parameters of the distribution.
struct param_type {
    typedef gamma_distribution<RealType> distribution_type;
    param_type(result_type alpha0 = result_type(1.0),
        RealType beta0 result_type(1.0));
    RealType alpha() const;
    RealType beta() 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