Stores the parameters of the distribution.
struct param_type {
    typedef lognormal_distribution<RealType> distribution_type;
    param_type(result_type m0 = result_type(0.0),
        result_type s0 = result_type(1.0));
    result_type m() const;
    result_type s() 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