[rand.dist.bern.geo]
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103937 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/random b/include/random
index 3298cd3..d5dafb1 100644
--- a/include/random
+++ b/include/random
@@ -666,7 +666,60 @@
};
template<class IntType = int>
- class geometric_distribution;
+class geometric_distribution
+{
+public:
+ // types
+ typedef IntType result_type;
+
+ class param_type
+ {
+ public:
+ typedef geometric_distribution distribution_type;
+
+ explicit param_type(double p = 0.5);
+
+ double p() const;
+
+ friend bool operator==(const param_type& x, const param_type& y);
+ friend bool operator!=(const param_type& x, const param_type& y);
+ };
+
+ // constructors and reset functions
+ explicit geometric_distribution(double p = 0.5);
+ explicit geometric_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 p() const;
+
+ param_type param() const;
+ void param(const param_type& parm);
+
+ result_type min() const;
+ result_type max() const;
+
+ friend bool operator==(const geometric_distribution& x,
+ const geometric_distribution& y);
+ friend bool operator!=(const geometric_distribution& x,
+ const geometric_distribution& y);
+
+ template <class charT, class traits>
+ friend
+ basic_ostream<charT, traits>&
+ operator<<(basic_ostream<charT, traits>& os,
+ const geometric_distribution& x);
+
+ template <class charT, class traits>
+ friend
+ basic_istream<charT, traits>&
+ operator>>(basic_istream<charT, traits>& is,
+ geometric_distribution& x);
+};
template<class IntType = int>
class negative_binomial_distribution
@@ -4269,6 +4322,89 @@
return __is;
}
+// geometric_distribution
+
+template<class _IntType = int>
+class geometric_distribution
+{
+public:
+ // types
+ typedef _IntType result_type;
+
+ class param_type
+ {
+ double __p_;
+ public:
+ typedef geometric_distribution distribution_type;
+
+ explicit param_type(double __p = 0.5) : __p_(__p) {}
+
+ double p() const {return __p_;}
+
+ friend bool operator==(const param_type& __x, const param_type& __y)
+ {return __x.__p_ == __y.__p_;}
+ friend bool operator!=(const param_type& __x, const param_type& __y)
+ {return !(__x == __y);}
+ };
+
+private:
+ param_type __p_;
+
+public:
+ // constructors and reset functions
+ explicit geometric_distribution(double __p = 0.5) : __p_(__p) {}
+ explicit geometric_distribution(const param_type& __p) : __p_(__p) {}
+ void reset() {}
+
+ // generating functions
+ template<class _URNG> result_type operator()(_URNG& __g)
+ {return (*this)(__g, __p_);}
+ template<class _URNG> result_type operator()(_URNG& __g, const param_type& __p)
+ {return negative_binomial_distribution<result_type>(1, __p.p())(__g);}
+
+ // property functions
+ double p() const {return __p_.p();}
+
+ param_type param() const {return __p_;}
+ void param(const param_type& __p) {__p_ = __p;}
+
+ result_type min() const {return 0;}
+ result_type max() const {return numeric_limits<result_type>::max();}
+
+ friend bool operator==(const geometric_distribution& __x,
+ const geometric_distribution& __y)
+ {return __x.__p_ == __y.__p_;}
+ friend bool operator!=(const geometric_distribution& __x,
+ const geometric_distribution& __y)
+ {return !(__x == __y);}
+};
+
+template <class _CharT, class _Traits, class _IntType>
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+ const geometric_distribution<_IntType>& __x)
+{
+ __save_flags<_CharT, _Traits> _(__os);
+ __os.flags(ios_base::dec | ios_base::left);
+ return __os << __x.p();
+}
+
+template <class _CharT, class _Traits, class _IntType>
+basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is,
+ geometric_distribution<_IntType>& __x)
+{
+ typedef geometric_distribution<_IntType> _Eng;
+ typedef typename _Eng::param_type param_type;
+ __save_flags<_CharT, _Traits> _(__is);
+ __is.flags(ios_base::dec | ios_base::skipws);
+ double __p;
+ __is >> __p;
+ if (!__is.fail())
+ __x.param(param_type(__p));
+ return __is;
+}
+
// chi_squared_distribution
template<class _RealType = double>