[rand.dist.norm.lognormal]

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103957 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-17 18:31:53 +00:00
parent c2b0dc7e33
commit 2bc36fcff3
19 changed files with 1185 additions and 1 deletions
--- a/include/random
+++ b/include/random
@@ -1124,7 +1124,62 @@ public:
 };

 template<class RealType = double>
-    class lognormal_distribution;
+class lognormal_distribution
+{
+public:
+    // types
+    typedef RealType result_type;
+
+    class param_type
+    {
+    public:
+        typedef lognormal_distribution distribution_type;
+
+        explicit param_type(result_type m = 0, result_type s = 1);
+
+        result_type m() const;
+        result_type s() 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 lognormal_distribution(result_type m = 0, result_type s = 1);
+    explicit lognormal_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 s() const;
+
+    param_type param() const;
+    void param(const param_type& parm);
+
+    result_type min() const;
+    result_type max() const;
+
+    friend bool operator==(const lognormal_distribution& x,
+                           const lognormal_distribution& y);
+    friend bool operator!=(const lognormal_distribution& x,
+                           const lognormal_distribution& y);
+
+    template <class charT, class traits>
+    friend
+    basic_ostream<charT, traits>&
+    operator<<(basic_ostream<charT, traits>& os,
+               const lognormal_distribution& x);
+    
+    template <class charT, class traits>
+    friend
+    basic_istream<charT, traits>&
+    operator>>(basic_istream<charT, traits>& is,
+               lognormal_distribution& x);
+};

 template<class RealType = double>
 class chi_squared_distribution
@@ -3796,6 +3851,111 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
    return __is;
 }

+// lognormal_distribution
+
+template<class _RealType = double>
+class lognormal_distribution
+{
+public:
+    // types
+    typedef _RealType result_type;
+
+    class param_type
+    {
+        normal_distribution<result_type> __nd_;
+    public:
+        typedef lognormal_distribution distribution_type;
+
+        explicit param_type(result_type __m = 0, result_type __s = 1)
+            : __nd_(__m, __s) {}
+
+        result_type m() const {return __nd_.mean();}
+        result_type s() const {return __nd_.stddev();}
+
+        friend bool operator==(const param_type& __x, const param_type& __y)
+            {return __x.__nd_ == __y.__nd_;}
+        friend bool operator!=(const param_type& __x, const param_type& __y)
+            {return !(__x == __y);}
+        friend class lognormal_distribution;
+
+        template <class _CharT, class _Traits, class _RT>
+        friend
+        basic_ostream<_CharT, _Traits>&
+        operator<<(basic_ostream<_CharT, _Traits>& __os,
+                   const lognormal_distribution<_RT>& __x);
+        
+        template <class _CharT, class _Traits, class _RT>
+        friend
+        basic_istream<_CharT, _Traits>&
+        operator>>(basic_istream<_CharT, _Traits>& __is,
+                   lognormal_distribution<_RT>& __x);
+    };
+
+private:
+    param_type __p_;
+
+public:
+    // constructor and reset functions
+    explicit lognormal_distribution(result_type __m = 0, result_type __s = 1)
+        : __p_(param_type(__m, __s)) {}
+    explicit lognormal_distribution(const param_type& __p)
+        : __p_(__p) {}
+    void reset() {__p_.__nd_.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 _STD::exp(const_cast<normal_distribution<result_type>&>(__p.__nd_)(__g));}
+
+    // property functions
+    result_type m() const {return __p_.m();}
+    result_type s() const {return __p_.s();}
+
+    param_type param() const {return __p_;}
+    void param(const param_type& __p) {return __p_ = __p;}
+
+    result_type min() const {return 0;}
+    result_type max() const {return numeric_limits<result_type>::infinity();}
+
+    friend bool operator==(const lognormal_distribution& __x,
+                           const lognormal_distribution& __y)
+        {return __x.__p_ == __y.__p_;}
+    friend bool operator!=(const lognormal_distribution& __x,
+                           const lognormal_distribution& __y)
+        {return !(__x == __y);}
+
+    template <class _CharT, class _Traits, class _RT>
+    friend
+    basic_ostream<_CharT, _Traits>&
+    operator<<(basic_ostream<_CharT, _Traits>& __os,
+               const lognormal_distribution<_RT>& __x);
+    
+    template <class _CharT, class _Traits, class _RT>
+    friend
+    basic_istream<_CharT, _Traits>&
+    operator>>(basic_istream<_CharT, _Traits>& __is,
+               lognormal_distribution<_RT>& __x);
+};
+
+template <class _CharT, class _Traits, class _RT>
+inline
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+           const lognormal_distribution<_RT>& __x)
+{
+    return __os << __x.__p_.__nd_;
+}
+
+template <class _CharT, class _Traits, class _RT>
+inline
+basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is,
+           lognormal_distribution<_RT>& __x)
+{
+    return __is >> __x.__p_.__nd_;
+}
+
 // poisson_distribution

 template<class _IntType = int>