A
poisson_distribution random number distribution
produces integer values
i≥0
distributed according to
the discrete probability function
P(i|μ)=e−μμii! .
The distribution parameter
μ
is also known as this distribution's
mean.template<class IntType = int>
class poisson_distribution
{
public:
using result_type = IntType;
using param_type = unspecified;
poisson_distribution() : poisson_distribution(1.0) {}
explicit poisson_distribution(double mean);
explicit poisson_distribution(const param_type& parm);
void reset();
template<class URBG>
result_type operator()(URBG& g);
template<class URBG>
result_type operator()(URBG& g, const param_type& parm);
double mean() const;
param_type param() const;
void param(const param_type& parm);
result_type min() const;
result_type max() const;
};