[rand.dist.bern.negbin] (original) (raw)

A negative_binomial_distribution random number distribution produces random integers i ≥ 0distributed according to the discrete probability function in Formula 29.7.

[Note 1:

This implies that P(i | k,p) is undefined when p == 1.

— _end note_]

namespace std { template<class IntType = int> class negative_binomial_distribution { public: using result_type = IntType;using param_type = unspecified; negative_binomial_distribution() : negative_binomial_distribution(1) {} explicit negative_binomial_distribution(IntType k, double p = 0.5);explicit negative_binomial_distribution(const param_type& parm);void reset();friend bool operator==(const negative_binomial_distribution& x,const negative_binomial_distribution& y);template<class URBG> result_type operator()(URBG& g);template<class URBG> result_type operator()(URBG& g, const param_type& parm); IntType k() const;double p() const; param_type param() const;void param(const param_type& parm); result_type min() const; result_type max() const;template<class charT, class traits> friend basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const negative_binomial_distribution& x);template<class charT, class traits> friend basic_istream<charT, traits>& operator>>(basic_istream<charT, traits>& is, negative_binomial_distribution& x);};}