Implement the K-distribution as an extension.

From-SVN: r191688

10 files changed, 653 insertions, 0 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 98d3551..42576bf 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,18 @@
+2012-09-24  Edward Smith-Rowland  <3dw4rd@verizon.net>
+
+	* include/ext/random: Add __gnu_cxx::k_distribution<> class.
+	* include/ext/random.tcc: Add out-of-line functions for
+	__gnu_cxx::k_distribution<>.
+	* testsuite/ext/random/k_distribution/operators/equal.cc: New file.
+	* testsuite/ext/random/k_distribution/operators/serialize.cc: New file.
+	* testsuite/ext/random/k_distribution/operators/inequal.cc: New file.
+	* testsuite/ext/random/k_distribution/cons/parms.cc: New file.
+	* testsuite/ext/random/k_distribution/cons/default.cc: New file.
+	* testsuite/ext/random/k_distribution/requirements/typedefs.cc:
+	New file.
+	* testsuite/ext/random/k_distribution/requirements/
+	explicit_instantiation/1.cc: New file.
+
 2012-09-24  François Dumont  <fdumont@gcc.gnu.org>
 
 	PR libstdc++/44436
diff --git a/libstdc++-v3/include/ext/random b/libstdc++-v3/include/ext/random
index 97bd014..c7321a9 100644
--- a/libstdc++-v3/include/ext/random
+++ b/libstdc++-v3/include/ext/random
@@ -1596,6 +1596,250 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	       const pareto_distribution<_RealType>& __d2)
     { return !(__d1 == __d2); }
 
+
+  /**
+   * @brief A K continuous distribution for random numbers.
+   *
+   * The formula for the K probability density function is
+   * @f[
+   *     p(x|\lambda, \mu, \nu) = \frac{2}{x}
+   *             \left(\frac{\lambda\nu x}{\mu}\right)^{\frac{\lambda + \nu}{2}}
+   *             \frac{1}{\Gamma(\lambda)\Gamma(\nu)}
+   *             K_{\nu - \lambda}\left(2\sqrt{\frac{\lambda\nu x}{\mu}}\right)
+   * @f]
+   * where @f$I_0(z)@f$ is the modified Bessel function of the second kind
+   * of order @f$\nu - \lambda@f$ and @f$\lambda > 0@f$, @f$\mu > 0@f$
+   * and @f$\nu > 0@f$.
+   *
+   * <table border=1 cellpadding=10 cellspacing=0>
+   * <caption align=top>Distribution Statistics</caption>
+   * <tr><td>Mean</td><td>@f$\mu@f$</td></tr>
+   * <tr><td>Variance</td><td>@f$\mu^2\frac{\lambda + \nu + 1}{\lambda\nu}@f$</td></tr>
+   * <tr><td>Range</td><td>@f$[0, \infty)@f$</td></tr>
+   * </table>
+   */
+  template<typename _RealType = double>
+    class
+    k_distribution
+    {
+      static_assert(std::is_floating_point<_RealType>::value,
+		    "template argument not a floating point type");
+
+    public:
+      /** The type of the range of the distribution. */
+      typedef _RealType result_type;
+      /** Parameter type. */
+      struct param_type
+      {
+	typedef k_distribution<result_type> distribution_type;
+
+	param_type(result_type __lambda_val = result_type(1),
+		   result_type __mu_val = result_type(1),
+		   result_type __nu_val = result_type(1))
+	: _M_lambda(__lambda_val), _M_mu(__mu_val), _M_nu(__nu_val)
+	{
+	  _GLIBCXX_DEBUG_ASSERT(_M_lambda > result_type(0));
+	  _GLIBCXX_DEBUG_ASSERT(_M_mu > result_type(0));
+	  _GLIBCXX_DEBUG_ASSERT(_M_nu > result_type(0));
+	}
+
+	result_type
+	lambda() const
+	{ return _M_lambda; }
+
+	result_type
+	mu() const
+	{ return _M_mu; }
+
+	result_type
+	nu() const
+	{ return _M_nu; }
+
+	friend bool
+	operator==(const param_type& __p1, const param_type& __p2)
+	{ return __p1._M_lambda == __p2._M_lambda
+              && __p1._M_mu == __p2._M_mu
+	      && __p1._M_nu == __p2._M_nu; }
+
+      private:
+	void _M_initialize();
+
+	result_type _M_lambda;
+	result_type _M_mu;
+	result_type _M_nu;
+      };
+
+      /**
+       * @brief Constructors.
+       */
+      explicit
+      k_distribution(result_type __lambda_val = result_type(1),
+		     result_type __mu_val = result_type(1),
+		     result_type __nu_val = result_type(1))
+      : _M_param(__lambda_val, __mu_val, __nu_val),
+	_M_gd1(__lambda_val, result_type(1) / __lambda_val),
+	_M_gd2(__nu_val, __mu_val / __nu_val)
+      { }
+
+      explicit
+      k_distribution(const param_type& __p)
+      : _M_param(__p),
+	_M_gd1(__p.lambda(), result_type(1) / __p.lambda()),
+	_M_gd2(__p.nu(), __p.mu() / __p.nu())
+      { }
+
+      /**
+       * @brief Resets the distribution state.
+       */
+      void
+      reset()
+      {
+	_M_gd1.reset();
+	_M_gd2.reset();
+      }
+
+      /**
+       * @brief Return the parameters of the distribution.
+       */
+      result_type
+      lambda() const
+      { return _M_param.lambda(); }
+
+      result_type
+      mu() const
+      { return _M_param.mu(); }
+
+      result_type
+      nu() const
+      { return _M_param.nu(); }
+
+      /**
+       * @brief Returns the parameter set of the distribution.
+       */
+      param_type
+      param() const
+      { return _M_param; }
+
+      /**
+       * @brief Sets the parameter set of the distribution.
+       * @param __param The new parameter set of the distribution.
+       */
+      void
+      param(const param_type& __param)
+      { _M_param = __param; }
+
+      /**
+       * @brief Returns the greatest lower bound value of the distribution.
+       */
+      result_type
+      min() const
+      { return result_type(0); }
+
+      /**
+       * @brief Returns the least upper bound value of the distribution.
+       */
+      result_type
+      max() const
+      { return std::numeric_limits<result_type>::max(); }
+
+      /**
+       * @brief Generating functions.
+       */
+      template<typename _UniformRandomNumberGenerator>
+	result_type
+	operator()(_UniformRandomNumberGenerator&);
+
+      template<typename _UniformRandomNumberGenerator>
+	result_type
+	operator()(_UniformRandomNumberGenerator&, const param_type&);
+
+      template<typename _ForwardIterator,
+	       typename _UniformRandomNumberGenerator>
+	void
+	__generate(_ForwardIterator __f, _ForwardIterator __t,
+		   _UniformRandomNumberGenerator& __urng)
+	{ this->__generate(__f, __t, __urng, this->param()); }
+
+      template<typename _ForwardIterator,
+	       typename _UniformRandomNumberGenerator>
+	void
+	__generate(_ForwardIterator __f, _ForwardIterator __t,
+		   _UniformRandomNumberGenerator& __urng,
+		   const param_type& __p)
+	{ this->__generate_impl(__f, __t, __urng, __p); }
+
+      template<typename _UniformRandomNumberGenerator>
+	void
+	__generate(result_type* __f, result_type* __t,
+		   _UniformRandomNumberGenerator& __urng,
+		   const param_type& __p)
+	{ this->__generate_impl(__f, __t, __urng, __p); }
+
+      /**
+       * @brief Return true if two K distributions have
+       *        the same parameters and the sequences that would
+       *        be generated are equal.
+       */
+      friend bool
+      operator==(const k_distribution& __d1,
+		 const k_distribution& __d2)
+      { return (__d1.param() == __d2.param()
+		&& __d1._M_gd1 == __d2._M_gd1
+		&& __d1._M_gd2 == __d2._M_gd2); }
+
+      /**
+       * @brief Inserts a %k_distribution random number distribution
+       * @p __x into the output stream @p __os.
+       *
+       * @param __os An output stream.
+       * @param __x  A %k_distribution random number distribution.
+       *
+       * @returns The output stream with the state of @p __x inserted or in
+       * an error state.
+       */
+      template<typename _RealType1, typename _CharT, typename _Traits>
+	friend std::basic_ostream<_CharT, _Traits>&
+	operator<<(std::basic_ostream<_CharT, _Traits>&,
+		   const k_distribution<_RealType1>&);
+
+      /**
+       * @brief Extracts a %k_distribution random number distribution
+       * @p __x from the input stream @p __is.
+       *
+       * @param __is An input stream.
+       * @param __x A %k_distribution random number
+       *            generator engine.
+       *
+       * @returns The input stream with @p __x extracted or in an error state.
+       */
+      template<typename _RealType1, typename _CharT, typename _Traits>
+	friend std::basic_istream<_CharT, _Traits>&
+	operator>>(std::basic_istream<_CharT, _Traits>&,
+		   k_distribution<_RealType1>&);
+
+    private:
+      template<typename _ForwardIterator,
+	       typename _UniformRandomNumberGenerator>
+	void
+	__generate_impl(_ForwardIterator __f, _ForwardIterator __t,
+			_UniformRandomNumberGenerator& __urng,
+			const param_type& __p);
+
+      param_type _M_param;
+
+      std::gamma_distribution<result_type> _M_gd1;
+      std::gamma_distribution<result_type> _M_gd2;
+    };
+
+  /**
+   * @brief Return true if two K distributions are not equal.
+   */
+  template<typename _RealType>
+    inline bool
+    operator!=(const k_distribution<_RealType>& __d1,
+	       const k_distribution<_RealType>& __d2)
+    { return !(__d1 == __d2); }
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace __gnu_cxx
 
diff --git a/libstdc++-v3/include/ext/random.tcc b/libstdc++-v3/include/ext/random.tcc
index 137b658..86bb67f 100644
--- a/libstdc++-v3/include/ext/random.tcc
+++ b/libstdc++-v3/include/ext/random.tcc
@@ -912,6 +912,103 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       return __is;
     }
 
+
+  template<typename _RealType>
+    template<typename _UniformRandomNumberGenerator>
+      typename k_distribution<_RealType>::result_type
+      k_distribution<_RealType>::
+      operator()(_UniformRandomNumberGenerator& __urng)
+      {
+	result_type __x = this->_M_gd1(__urng);
+	result_type __y = this->_M_gd2(__urng);
+	return std::sqrt(__x * __y);
+      }
+
+  template<typename _RealType>
+    template<typename _UniformRandomNumberGenerator>
+      typename k_distribution<_RealType>::result_type
+      k_distribution<_RealType>::
+      operator()(_UniformRandomNumberGenerator& __urng,
+		 const param_type& __p)
+      {
+	typename std::gamma_distribution<result_type>::param_type
+	  __p1(__p.lambda(), result_type(1) / __p.lambda()),
+	  __p2(__p.nu(), __p.mu() / __p.nu());
+	result_type __x = this->_M_gd1(__p1, __urng);
+	result_type __y = this->_M_gd2(__p2, __urng);
+	return std::sqrt(__x * __y);
+      }
+
+  template<typename _RealType>
+    template<typename _OutputIterator,
+	     typename _UniformRandomNumberGenerator>
+      void
+      k_distribution<_RealType>::
+      __generate_impl(_OutputIterator __f, _OutputIterator __t,
+		      _UniformRandomNumberGenerator& __urng,
+		      const param_type& __p)
+      {
+	__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator>)
+
+	typename std::gamma_distribution<result_type>::param_type
+	  __p1(__p.lambda(), result_type(1) / __p.lambda()),
+	  __p2(__p.nu(), __p.mu() / __p.nu());
+	while (__f != __t)
+	  {
+	    result_type __x = this->_M_gd1(__p1, __urng);
+	    result_type __y = this->_M_gd2(__p2, __urng);
+	    *__f++ = std::sqrt(__x * __y);
+	  }
+      }
+
+  template<typename _RealType, typename _CharT, typename _Traits>
+    std::basic_ostream<_CharT, _Traits>&
+    operator<<(std::basic_ostream<_CharT, _Traits>& __os,
+	       const k_distribution<_RealType>& __x)
+    {
+      typedef std::basic_ostream<_CharT, _Traits>  __ostream_type;
+      typedef typename __ostream_type::ios_base    __ios_base;
+
+      const typename __ios_base::fmtflags __flags = __os.flags();
+      const _CharT __fill = __os.fill();
+      const std::streamsize __precision = __os.precision();
+      const _CharT __space = __os.widen(' ');
+      __os.flags(__ios_base::scientific | __ios_base::left);
+      __os.fill(__space);
+      __os.precision(std::numeric_limits<_RealType>::max_digits10);
+
+      __os << __x.lambda() << __space << __x.mu() << __space << __x.nu();
+      __os << __space << __x._M_gd1;
+      __os << __space << __x._M_gd2;
+
+      __os.flags(__flags);
+      __os.fill(__fill);
+      __os.precision(__precision);
+      return __os;
+    }
+
+  template<typename _RealType, typename _CharT, typename _Traits>
+    std::basic_istream<_CharT, _Traits>&
+    operator>>(std::basic_istream<_CharT, _Traits>& __is,
+	       k_distribution<_RealType>& __x)
+    {
+      typedef std::basic_istream<_CharT, _Traits>  __istream_type;
+      typedef typename __istream_type::ios_base    __ios_base;
+
+      const typename __ios_base::fmtflags __flags = __is.flags();
+      __is.flags(__ios_base::dec | __ios_base::skipws);
+
+      _RealType __lambda_val, __mu_val, __nu_val;
+      __is >> __lambda_val >> __mu_val >> __nu_val;
+      __is >> __x._M_gd1;
+      __is >> __x._M_gd2;
+      __x.param(typename k_distribution<_RealType>::
+		param_type(__lambda_val, __mu_val, __nu_val));
+
+      __is.flags(__flags);
+      return __is;
+    }
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/cons/default.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/cons/default.cc
new file mode 100644
index 0000000..3a7ade8
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/cons/default.cc
@@ -0,0 +1,48 @@
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// 2012-09-24  Edward M. Smith-Rowland <3dw4rd@verizon.net>
+//
+// Copyright (C) 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 26.4.8.3.* Class template k_distribution [rand.dist.ext.k]
+// 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist]
+
+#include <ext/random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  __gnu_cxx::k_distribution<> u;
+  VERIFY( u.lambda() == 1.0 );
+  VERIFY( u.mu() == 1.0 );
+  VERIFY( u.nu() == 1.0 );
+  VERIFY( u.min() == 0.0 );
+  typedef __gnu_cxx::k_distribution<>::result_type result_type;
+  VERIFY( u.max() == std::numeric_limits<result_type>::max() );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/cons/parms.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/cons/parms.cc
new file mode 100644
index 0000000..396be38
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/cons/parms.cc
@@ -0,0 +1,48 @@
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// 2012-09-24  Edward M. Smith-Rowland <3dw4rd@verizon.net>
+//
+// Copyright (C) 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 26.4.8.3.* Class template k_distribution [rand.dist.ext.k]
+// 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist]
+
+#include <ext/random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  __gnu_cxx::k_distribution<> u(2.0, 1.5, 3.0);
+  VERIFY( u.lambda() == 2.0 );
+  VERIFY( u.mu() == 1.5 );
+  VERIFY( u.nu() == 3.0 );
+  VERIFY( u.min() == 0.0 );
+  typedef __gnu_cxx::k_distribution<>::result_type result_type;
+  VERIFY( u.max() == std::numeric_limits<result_type>::max() );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/operators/equal.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/operators/equal.cc
new file mode 100644
index 0000000..51e1081
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/operators/equal.cc
@@ -0,0 +1,44 @@
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// 2012-09-24  Edward M. Smith-Rowland  <3dw4rd@verizon.net>
+//
+// Copyright (C) 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 26.5.8.4.5 Class template k_distribution [rand.dist.ext.k]
+
+#include <ext/random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  __gnu_cxx::k_distribution<double> u(2.0, 1.5, 3.0), v, w;
+
+  VERIFY( v == w );
+  VERIFY( !(u == v) );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/operators/inequal.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/operators/inequal.cc
new file mode 100644
index 0000000..082ed28
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/operators/inequal.cc
@@ -0,0 +1,44 @@
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// 2012-09-24  Edward M. Smith-Rowland  <3dw4rd@verizon.net>
+//
+// Copyright (C) 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 26.5.8.4.5 Class template k_distribution [rand.dist.ext.k]
+
+#include <ext/random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  __gnu_cxx::k_distribution<double> u(2.0, 1.5, 3.0), v, w;
+
+  VERIFY( u != v );
+  VERIFY( !(v != w) );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/operators/serialize.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/operators/serialize.cc
new file mode 100644
index 0000000..a7647ad
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/operators/serialize.cc
@@ -0,0 +1,51 @@
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// 2012-09-24  Edward M. Smith-Rowland  <3dw4rd@verizon.net>
+//
+// Copyright (C) 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 26.4.8.3.* Class template k_distribution [rand.dist.ext.k]
+// 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist]
+
+#include <ext/random>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::stringstream str;
+  __gnu_cxx::k_distribution<double> u(2.0, 1.5, 3.0), v;
+  std::minstd_rand0 rng;
+
+  u(rng); // advance
+  str << u;
+
+  str >> v;
+  VERIFY( u == v );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/requirements/explicit_instantiation/1.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/requirements/explicit_instantiation/1.cc
new file mode 100644
index 0000000..539c774
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/requirements/explicit_instantiation/1.cc
@@ -0,0 +1,26 @@
+// { dg-do compile }
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// Copyright (C) 2012 Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <ext/random>
+
+template class __gnu_cxx::k_distribution<float>;
+template class __gnu_cxx::k_distribution<double>;
+template class __gnu_cxx::k_distribution<long double>;
diff --git a/libstdc++-v3/testsuite/ext/random/k_distribution/requirements/typedefs.cc b/libstdc++-v3/testsuite/ext/random/k_distribution/requirements/typedefs.cc
new file mode 100644
index 0000000..2286fbb
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/random/k_distribution/requirements/typedefs.cc
@@ -0,0 +1,36 @@
+// { dg-do compile }
+// { dg-options "-std=c++11" }
+// { dg-require-cstdint "" }
+//
+// 2012-09-24  Edward M. Smith-Rowland <3dw4rd@verizon.net>
+//
+// Copyright (C) 2012 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 26.4.8.3.* Class template k_distribution [rand.dist.ext.k]
+// 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist]
+
+#include <ext/random>
+
+void
+test01()
+{
+  typedef __gnu_cxx::k_distribution<double> test_type;
+
+  typedef test_type::result_type result_type;
+  typedef test_type::param_type param_type;
+}