A poisson_distribution random number distribution produces integer values i ≥ 0 distributed according to the discrete probability function The distribution parameter μ is also known as this distribution's mean.
template<class IntType = int> class poisson_distribution{ public: // types typedef IntType result_type; typedef unspecified param_type; // constructors and reset functions explicit poisson_distribution(double mean = 1.0); explicit poisson_distribution(const param_type& parm); void reset(); // generating functions template<class URNG> result_type operator()(URNG& g); template<class URNG> result_type operator()(URNG& g, const param_type& parm); // property functions double mean() const; param_type param() const; void param(const param_type& parm); result_type min() const; result_type max() const; };
Requires: 0 < mean .
Effects: Constructs a poisson_distribution object; mean corresponds to the parameter of the distribution.
Returns: The value of the mean parameter with which the object was constructed.