[rand.dist.pois.poisson]

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103814 91177308-0d34-0410-b5e6-96231b3b80d8

include/random

@@ -672,7 +672,60 @@ template<class IntType = int>
     class negative_binomial_distribution;
 
 template<class IntType = int>
-    class poisson_distribution;
+class poisson_distribution
+{
+public:
+    // types
+    typedef IntType result_type;
+
+    class param_type
+    {
+    public:
+        typedef poisson_distribution distribution_type;
+
+        explicit param_type(double mean = 1.0);
+
+        double mean() 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 poisson_distribution(double mean = 1.0);
+    explicit poisson_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 mean() const;
+
+    param_type param() const;
+    void param(const param_type& parm);
+
+    result_type min() const;
+    result_type max() const;
+
+    friend bool operator==(const poisson_distribution& x,
+                           const poisson_distribution& y);
+    friend bool operator!=(const poisson_distribution& x,
+                           const poisson_distribution& y);
+
+    template <class charT, class traits>
+    friend
+    basic_ostream<charT, traits>&
+    operator<<(basic_ostream<charT, traits>& os,
+               const poisson_distribution& x);
+    
+    template <class charT, class traits>
+    friend
+    basic_istream<charT, traits>&
+    operator>>(basic_istream<charT, traits>& is,
+               poisson_distribution& x);
+};
 
 template<class RealType = double>
 class exponential_distribution
@@ -3181,6 +3234,149 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
     return __is;
 }
 
+// poisson_distribution
+
+template<class _IntType = int>
+class poisson_distribution
+{
+public:
+    // types
+    typedef _IntType result_type;
+
+    class param_type
+    {
+        double __mean_;
+        double __sq_;
+        double __alxm_;
+        double __g_;
+    public:
+        typedef poisson_distribution distribution_type;
+
+        explicit param_type(double __mean = 1.0);
+
+        double mean() const {return __mean_;}
+
+        friend bool operator==(const param_type& __x, const param_type& __y)
+            {return __x.__mean_ == __y.__mean_;}
+        friend bool operator!=(const param_type& __x, const param_type& __y)
+            {return !(__x == __y);}
+
+        friend class poisson_distribution;
+    };
+
+private:
+    param_type __p_;
+
+public:
+    // constructors and reset functions
+    explicit poisson_distribution(double __mean = 1.0) : __p_(__mean) {}
+    explicit poisson_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
+    double mean() const {return __p_.mean();}
+
+    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 poisson_distribution& __x,
+                           const poisson_distribution& __y)
+        {return __x.__p_ == __y.__p_;}
+    friend bool operator!=(const poisson_distribution& __x,
+                           const poisson_distribution& __y)
+        {return !(__x == __y);}
+};
+
+template<class _IntType>
+poisson_distribution<_IntType>::param_type::param_type(double __mean)
+    : __mean_(__mean)
+{
+    if (__mean_ < 12.0)
+    {
+        __g_ = _STD::exp(-__mean_);
+        __alxm_ = 0;
+        __sq_ = 0;
+    }
+    else
+    {
+        __sq_ = _STD::sqrt(2.0 * __mean_);
+        __alxm_ = _STD::log(__mean_);
+        __g_ = __mean_ * __alxm_ - _STD::lgamma(__mean_ + 1);
+    }
+}
+
+template <class _IntType>
+template<class _URNG>
+_IntType
+poisson_distribution<_IntType>::operator()(_URNG& __g, const param_type& __p)
+{
+    result_type __x;
+    uniform_real_distribution<double> __gen;
+    if (__p.__mean_ < 12.0)
+    {
+        __x = result_type(~0);
+        double __t = 1;
+        do
+        {
+            ++__x;
+            __t *= __gen(__g);
+        } while (__t > __p.__g_);
+    }
+    else
+    {
+        double __t;
+        const double __pi = 3.14159265358979323846264338328;
+        do
+        {
+            double _X;
+            double __y;
+            do
+            {
+                __y = _STD::tan(__pi * __gen(__g));
+                _X = __p.__sq_ * __y + __p.__mean_;
+            } while (_X < 0);
+            __x = static_cast<result_type>(_X);
+            __t = 0.9 * (1 + __y * __y) * _STD::exp(__x * __p.__alxm_ -
+                                            _STD::lgamma(__x + 1.0) - __p.__g_);
+        } while (__gen(__g) > __t);
+    }
+    return __x;
+}
+
+template <class _CharT, class _Traits, class _IntType>
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+           const poisson_distribution<_IntType>& __x)
+{
+    __save_flags<_CharT, _Traits> _(__os);
+    __os.flags(ios_base::dec | ios_base::left);
+    return __os << __x.mean();
+}
+
+template <class _CharT, class _Traits, class _IntType>
+basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is,
+           poisson_distribution<_IntType>& __x)
+{
+    typedef poisson_distribution<_IntType> _Eng;
+    typedef typename _Eng::param_type param_type;
+    __save_flags<_CharT, _Traits> _(__is);
+    __is.flags(ios_base::dec | ios_base::skipws);
+    double __mean;
+    __is >> __mean;
+    if (!__is.fail())
+        __x.param(param_type(__mean));
+    return __is;
+}
+
 // exponential_distribution
 
 template<class _RealType = double>

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/assign.pass.cpp

@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// poisson_distribution& operator=(const poisson_distribution&);
+
+#include <random>
+#include <cassert>
+
+void
+test1()
+{
+    typedef std::poisson_distribution<> D;
+    D d1(0.75);
+    D d2;
+    assert(d1 != d2);
+    d2 = d1;
+    assert(d1 == d2);
+}
+
+int main()
+{
+    test1();
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/copy.pass.cpp

@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// poisson_distribution(const poisson_distribution&);
+
+#include <random>
+#include <cassert>
+
+void
+test1()
+{
+    typedef std::poisson_distribution<> D;
+    D d1(1.75);
+    D d2 = d1;
+    assert(d1 == d2);
+}
+
+int main()
+{
+    test1();
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_double.pass.cpp

@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// explicit poisson_distribution(RealType lambda = 1.0);
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        D d;
+        assert(d.mean() == 1);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        D d(3.5);
+        assert(d.mean() == 3.5);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_param.pass.cpp

@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// explicit poisson_distribution(const param_type& parm);
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type P;
+        P p(0.25);
+        D d(p);
+        assert(d.mean() == 0.25);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eq.pass.cpp

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// bool operator=(const poisson_distribution& x,
+//                const poisson_distribution& y);
+// bool operator!(const poisson_distribution& x,
+//                const poisson_distribution& y);
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        D d1(.25);
+        D d2(.25);
+        assert(d1 == d2);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        D d1(.28);
+        D d2(.25);
+        assert(d1 != d2);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp

@@ -0,0 +1,89 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// template<class _URNG> result_type operator()(_URNG& g);
+
+#include <random>
+#include <cassert>
+#include <vector>
+#include <numeric>
+
+template <class T>
+inline
+T
+sqr(T x)
+{
+    return x * x;
+}
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef std::minstd_rand G;
+        G g;
+        D d(2);
+        const int N = 100000;
+        std::vector<double> u;
+        for (int i = 0; i < N; ++i)
+            u.push_back(d(g));
+        double mean = std::accumulate(u.begin(), u.end(), 0.0) / u.size();
+        double var = 0;
+        for (int i = 0; i < u.size(); ++i)
+            var += sqr(u[i] - mean);
+        var /= u.size();
+        double x_mean = d.mean();
+        double x_var = d.mean();
+        assert(std::abs(mean - x_mean) / x_mean < 0.01);
+        assert(std::abs(var - x_var) / x_var < 0.01);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        typedef std::minstd_rand G;
+        G g;
+        D d(0.75);
+        const int N = 100000;
+        std::vector<double> u;
+        for (int i = 0; i < N; ++i)
+            u.push_back(d(g));
+        double mean = std::accumulate(u.begin(), u.end(), 0.0) / u.size();
+        double var = 0;
+        for (int i = 0; i < u.size(); ++i)
+            var += sqr(u[i] - mean);
+        var /= u.size();
+        double x_mean = d.mean();
+        double x_var = d.mean();
+        assert(std::abs(mean - x_mean) / x_mean < 0.01);
+        assert(std::abs(var - x_var) / x_var < 0.01);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        typedef std::minstd_rand G;
+        G g;
+        D d(20);
+        const int N = 10000;
+        std::vector<double> u;
+        for (int i = 0; i < N; ++i)
+            u.push_back(d(g));
+        double mean = std::accumulate(u.begin(), u.end(), 0.0) / u.size();
+        double var = 0;
+        for (int i = 0; i < u.size(); ++i)
+            var += sqr(u[i] - mean);
+        var /= u.size();
+        double x_mean = d.mean();
+        double x_var = d.mean();
+        assert(std::abs(mean - x_mean) / x_mean < 0.01);
+        assert(std::abs(var - x_var) / x_var < 0.01);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval_param.pass.cpp

@@ -0,0 +1,95 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// template<class _URNG> result_type operator()(_URNG& g, const param_type& parm);
+
+#include <random>
+#include <cassert>
+#include <vector>
+#include <numeric>
+
+template <class T>
+inline
+T
+sqr(T x)
+{
+    return x * x;
+}
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type P;
+        typedef std::minstd_rand G;
+        G g;
+        D d(.75);
+        P p(2);
+        const int N = 100000;
+        std::vector<double> u;
+        for (int i = 0; i < N; ++i)
+            u.push_back(d(g, p));
+        double mean = std::accumulate(u.begin(), u.end(), 0.0) / u.size();
+        double var = 0;
+        for (int i = 0; i < u.size(); ++i)
+            var += sqr(u[i] - mean);
+        var /= u.size();
+        double x_mean = p.mean();
+        double x_var = p.mean();
+        assert(std::abs(mean - x_mean) / x_mean < 0.01);
+        assert(std::abs(var - x_var) / x_var < 0.01);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type P;
+        typedef std::minstd_rand G;
+        G g;
+        D d(2);
+        P p(.75);
+        const int N = 100000;
+        std::vector<double> u;
+        for (int i = 0; i < N; ++i)
+            u.push_back(d(g, p));
+        double mean = std::accumulate(u.begin(), u.end(), 0.0) / u.size();
+        double var = 0;
+        for (int i = 0; i < u.size(); ++i)
+            var += sqr(u[i] - mean);
+        var /= u.size();
+        double x_mean = p.mean();
+        double x_var = p.mean();
+        assert(std::abs(mean - x_mean) / x_mean < 0.01);
+        assert(std::abs(var - x_var) / x_var < 0.01);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type P;
+        typedef std::minstd_rand G;
+        G g;
+        D d(2);
+        P p(20);
+        const int N = 10000;
+        std::vector<double> u;
+        for (int i = 0; i < N; ++i)
+            u.push_back(d(g, p));
+        double mean = std::accumulate(u.begin(), u.end(), 0.0) / u.size();
+        double var = 0;
+        for (int i = 0; i < u.size(); ++i)
+            var += sqr(u[i] - mean);
+        var /= u.size();
+        double x_mean = p.mean();
+        double x_var = p.mean();
+        assert(std::abs(mean - x_mean) / x_mean < 0.01);
+        assert(std::abs(var - x_var) / x_var < 0.01);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/get_param.pass.cpp

@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// param_type param() const;
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type P;
+        P p(.125);
+        D d(p);
+        assert(d.param() == p);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/io.pass.cpp

@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// template <class CharT, class Traits, class IntType>
+// basic_ostream<CharT, Traits>&
+// operator<<(basic_ostream<CharT, Traits>& os,
+//            const poisson_distribution<RealType>& x);
+
+// template <class CharT, class Traits, class IntType>
+// basic_istream<CharT, Traits>&
+// operator>>(basic_istream<CharT, Traits>& is,
+//            poisson_distribution<RealType>& x);
+
+#include <random>
+#include <sstream>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        D d1(7);
+        std::ostringstream os;
+        os << d1;
+        std::istringstream is(os.str());
+        D d2;
+        is >> d2;
+        assert(d1 == d2);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/max.pass.cpp

@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// result_type max() const;
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        D d(.25);
+        D::result_type m = d.max();
+        assert(m == std::numeric_limits<int>::max());
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/min.pass.cpp

@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+
+// result_type min() const;
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        D d(.5);
+        assert(d.min() == 0);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_assign.pass.cpp

@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+// {
+//     class param_type;
+
+#include <random>
+#include <limits>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        param_type p0(.7);
+        param_type p;
+        p = p0;
+        assert(p.mean() == .7);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_copy.pass.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+// {
+//     class param_type;
+
+#include <random>
+#include <limits>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        param_type p0(.125);
+        param_type p = p0;
+        assert(p.mean() == .125);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_ctor.pass.cpp

@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+// {
+//     class param_type;
+
+#include <random>
+#include <limits>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        param_type p;
+        assert(p.mean() == 1);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        param_type p(10);
+        assert(p.mean() == 10);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_eq.pass.cpp

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+// {
+//     class param_type;
+
+#include <random>
+#include <limits>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        param_type p1(0.75);
+        param_type p2(0.75);
+        assert(p1 == p2);
+    }
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        param_type p1(0.75);
+        param_type p2(0.5);
+        assert(p1 != p2);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_types.pass.cpp

@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+// {
+//     class param_type;
+
+#include <random>
+#include <type_traits>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type param_type;
+        typedef param_type::distribution_type distribution_type;
+        static_assert((std::is_same<D, distribution_type>::value), "");
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/set_param.pass.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class RealType = double>
+// class poisson_distribution;
+
+// void param(const param_type& parm);
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::param_type P;
+        P p(0.25);
+        D d(0.75);
+        d.param(p);
+        assert(d.param() == p);
+    }
+}

test/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/types.pass.cpp

@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template<class IntType = int>
+// class poisson_distribution
+// {
+// public:
+//     // types
+//     typedef RealType result_type;
+
+#include <random>
+#include <type_traits>
+
+int main()
+{
+    {
+        typedef std::poisson_distribution<> D;
+        typedef D::result_type result_type;
+        static_assert((std::is_same<result_type, int>::value), "");
+    }
+    {
+        typedef std::poisson_distribution<unsigned long long> D;
+        typedef D::result_type result_type;
+        static_assert((std::is_same<result_type, unsigned long long>::value), "");
+    }
+}