[rand.dist.norm.f]
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@104035 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/random b/include/random
index c173414..f1ae33b 100644
--- a/include/random
+++ b/include/random
@@ -1296,7 +1296,62 @@
};
template<class RealType = double>
- class fisher_f_distribution;
+class fisher_f_distribution
+{
+public:
+ // types
+ typedef RealType result_type;
+
+ class param_type
+ {
+ public:
+ typedef result_type distribution_type;
+
+ explicit param_type(result_type m = 1, result_type n = 1);
+
+ result_type m() const;
+ result_type n() const;
+
+ friend bool operator==(const param_type& x, const param_type& y);
+ friend bool operator!=(const param_type& x, const param_type& y);
+ };
+
+ // constructor and reset functions
+ explicit fisher_f_distribution(result_type m = 1, result_type n = 1);
+ explicit fisher_f_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
+ result_type m() const;
+ result_type n() const;
+
+ param_type param() const;
+ void param(const param_type& parm);
+
+ result_type min() const;
+ result_type max() const;
+
+ friend bool operator==(const fisher_f_distribution& x,
+ const fisher_f_distribution& y);
+ friend bool operator!=(const fisher_f_distribution& x,
+ const fisher_f_distribution& y);
+
+ template <class charT, class traits>
+ friend
+ basic_ostream<charT, traits>&
+ operator<<(basic_ostream<charT, traits>& os,
+ const fisher_f_distribution& x);
+
+ template <class charT, class traits>
+ friend
+ basic_istream<charT, traits>&
+ operator>>(basic_istream<charT, traits>& is,
+ fisher_f_distribution& x);
+};
template<class RealType = double>
class student_t_distribution;
@@ -4921,18 +4976,6 @@
friend bool operator!=(const cauchy_distribution& __x,
const cauchy_distribution& __y)
{return !(__x == __y);}
-
- template <class _CharT, class _Traits, class _RT>
- friend
- basic_ostream<_CharT, _Traits>&
- operator<<(basic_ostream<_CharT, _Traits>& __os,
- const cauchy_distribution<_RT>& __x);
-
- template <class _CharT, class _Traits, class _RT>
- friend
- basic_istream<_CharT, _Traits>&
- operator>>(basic_istream<_CharT, _Traits>& __is,
- cauchy_distribution<_RT>& __x);
};
template <class _RealType>
@@ -4977,6 +5020,109 @@
return __is;
}
+// fisher_f_distribution
+
+template<class _RealType = double>
+class fisher_f_distribution
+{
+public:
+ // types
+ typedef _RealType result_type;
+
+ class param_type
+ {
+ result_type __m_;
+ result_type __n_;
+ public:
+ typedef fisher_f_distribution distribution_type;
+
+ explicit param_type(result_type __m = 1, result_type __n = 1)
+ : __m_(__m), __n_(__n) {}
+
+ result_type m() const {return __m_;}
+ result_type n() const {return __n_;}
+
+ friend bool operator==(const param_type& __x, const param_type& __y)
+ {return __x.__m_ == __y.__m_ && __x.__n_ == __y.__n_;}
+ friend bool operator!=(const param_type& __x, const param_type& __y)
+ {return !(__x == __y);}
+ };
+
+private:
+ param_type __p_;
+
+public:
+ // constructor and reset functions
+ explicit fisher_f_distribution(result_type __m = 1, result_type __n = 1)
+ : __p_(param_type(__m, __n)) {}
+ explicit fisher_f_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);
+
+ // property functions
+ result_type m() const {return __p_.m();}
+ result_type n() const {return __p_.n();}
+
+ 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>::infinity();}
+
+ friend bool operator==(const fisher_f_distribution& __x,
+ const fisher_f_distribution& __y)
+ {return __x.__p_ == __y.__p_;}
+ friend bool operator!=(const fisher_f_distribution& __x,
+ const fisher_f_distribution& __y)
+ {return !(__x == __y);}
+};
+
+template <class _RealType>
+template<class _URNG>
+_RealType
+fisher_f_distribution<_RealType>::operator()(_URNG& __g, const param_type& __p)
+{
+ gamma_distribution<result_type> __gdm(__p.m() * result_type(.5));
+ gamma_distribution<result_type> __gdn(__p.n() * result_type(.5));
+ return __p.n() * __gdm(__g) / (__p.m() * __gdn(__g));
+}
+
+template <class _CharT, class _Traits, class _RT>
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+ const fisher_f_distribution<_RT>& __x)
+{
+ __save_flags<_CharT, _Traits> _(__os);
+ __os.flags(ios_base::dec | ios_base::left);
+ _CharT __sp = __os.widen(' ');
+ __os.fill(__sp);
+ __os << __x.m() << __sp << __x.n();
+ return __os;
+}
+
+template <class _CharT, class _Traits, class _RT>
+basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is,
+ fisher_f_distribution<_RT>& __x)
+{
+ typedef fisher_f_distribution<_RT> _Eng;
+ typedef typename _Eng::result_type result_type;
+ typedef typename _Eng::param_type param_type;
+ __save_flags<_CharT, _Traits> _(__is);
+ __is.flags(ios_base::dec | ios_base::skipws);
+ result_type __m;
+ result_type __n;
+ __is >> __m >> __n;
+ if (!__is.fail())
+ __x.param(param_type(__m, __n));
+ return __is;
+}
+
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_RANDOM