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+/* boost random/negative_binomial_distribution.hpp header file
+ *
+ * Copyright Steven Watanabe 2010
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org for most recent version including documentation.
+ *
+ * $Id$
+ */
+
+#ifndef BOOST_RANDOM_NEGATIVE_BINOMIAL_DISTRIBUTION_HPP_INCLUDED
+#define BOOST_RANDOM_NEGATIVE_BINOMIAL_DISTRIBUTION_HPP_INCLUDED
+
+#include <iosfwd>
+
+#include <boost/limits.hpp>
+#include <boost/random/detail/config.hpp>
+#include <boost/random/gamma_distribution.hpp>
+#include <boost/random/poisson_distribution.hpp>
+
+namespace boost {
+namespace random {
+
+/**
+ * The negative binomial distribution is an integer valued
+ * distribution with two parameters, @c k and @c p.  The
+ * distribution produces non-negative values.
+ *
+ * The distribution function is
+ * \f$\displaystyle P(i) = {k+i-1\choose i}p^k(1-p)^i\f$.
+ *
+ * This implementation uses a gamma-poisson mixture.
+ */
+template<class IntType = int, class RealType = double>
+class negative_binomial_distribution {
+public:
+    typedef IntType result_type;
+    typedef RealType input_type;
+
+    class param_type {
+    public:
+        typedef negative_binomial_distribution distribution_type;
+        /**
+         * Construct a param_type object.  @c k and @c p
+         * are the parameters of the distribution.
+         *
+         * Requires: k >=0 && 0 <= p <= 1
+         */
+        explicit param_type(IntType k_arg = 1, RealType p_arg = RealType (0.5))
+          : _k(k_arg), _p(p_arg)
+        {}
+        /** Returns the @c k parameter of the distribution. */
+        IntType k() const { return _k; }
+        /** Returns the @c p parameter of the distribution. */
+        RealType p() const { return _p; }
+#ifndef BOOST_RANDOM_NO_STREAM_OPERATORS
+        /** Writes the parameters of the distribution to a @c std::ostream. */
+        template<class CharT, class Traits>
+        friend std::basic_ostream<CharT,Traits>&
+        operator<<(std::basic_ostream<CharT,Traits>& os,
+                   const param_type& parm)
+        {
+            os << parm._p << " " << parm._k;
+            return os;
+        }
+    
+        /** Reads the parameters of the distribution from a @c std::istream. */
+        template<class CharT, class Traits>
+        friend std::basic_istream<CharT,Traits>&
+        operator>>(std::basic_istream<CharT,Traits>& is, param_type& parm)
+        {
+            is >> parm._p >> std::ws >> parm._k;
+            return is;
+        }
+#endif
+        /** Returns true if the parameters have the same values. */
+        friend bool operator==(const param_type& lhs, const param_type& rhs)
+        {
+            return lhs._k == rhs._k && lhs._p == rhs._p;
+        }
+        /** Returns true if the parameters have different values. */
+        friend bool operator!=(const param_type& lhs, const param_type& rhs)
+        {
+            return !(lhs == rhs);
+        }
+    private:
+        IntType _k;
+        RealType _p;
+    };
+    
+    /**
+     * Construct a @c negative_binomial_distribution object. @c k and @c p
+     * are the parameters of the distribution.
+     *
+     * Requires: k >=0 && 0 <= p <= 1
+     */
+    explicit negative_binomial_distribution(IntType k_arg = 1,
+                                            RealType p_arg = RealType(0.5))
+      : _k(k_arg), _p(p_arg)
+    {}
+    
+    /**
+     * Construct an @c negative_binomial_distribution object from the
+     * parameters.
+     */
+    explicit negative_binomial_distribution(const param_type& parm)
+      : _k(parm.k()), _p(parm.p())
+    {}
+    
+    /**
+     * Returns a random variate distributed according to the
+     * negative binomial distribution.
+     */
+    template<class URNG>
+    IntType operator()(URNG& urng) const
+    {
+        gamma_distribution<RealType> gamma(_k, (1-_p)/_p);
+        poisson_distribution<IntType, RealType> poisson(gamma(urng));
+        return poisson(urng);
+    }
+    
+    /**
+     * Returns a random variate distributed according to the negative
+     * binomial distribution with parameters specified by @c param.
+     */
+    template<class URNG>
+    IntType operator()(URNG& urng, const param_type& parm) const
+    {
+        return negative_binomial_distribution(parm)(urng);
+    }
+
+    /** Returns the @c k parameter of the distribution. */
+    IntType k() const { return _k; }
+    /** Returns the @c p parameter of the distribution. */
+    RealType p() const { return _p; }
+
+    /** Returns the smallest value that the distribution can produce. */
+    IntType min BOOST_PREVENT_MACRO_SUBSTITUTION() const { return 0; }
+    /** Returns the largest value that the distribution can produce. */
+    IntType max BOOST_PREVENT_MACRO_SUBSTITUTION() const
+    { return (std::numeric_limits<IntType>::max)(); }
+
+    /** Returns the parameters of the distribution. */
+    param_type param() const { return param_type(_k, _p); }
+    /** Sets parameters of the distribution. */
+    void param(const param_type& parm)
+    {
+        _k = parm.k();
+        _p = parm.p();
+    }
+
+    /**
+     * Effects: Subsequent uses of the distribution do not depend
+     * on values produced by any engine prior to invoking reset.
+     */
+    void reset() { }
+
+#ifndef BOOST_RANDOM_NO_STREAM_OPERATORS
+    /** Writes the parameters of the distribution to a @c std::ostream. */
+    template<class CharT, class Traits>
+    friend std::basic_ostream<CharT,Traits>&
+    operator<<(std::basic_ostream<CharT,Traits>& os,
+               const negative_binomial_distribution& bd)
+    {
+        os << bd.param();
+        return os;
+    }
+    
+    /** Reads the parameters of the distribution from a @c std::istream. */
+    template<class CharT, class Traits>
+    friend std::basic_istream<CharT,Traits>&
+    operator>>(std::basic_istream<CharT,Traits>& is,
+               negative_binomial_distribution& bd)
+    {
+        bd.read(is);
+        return is;
+    }
+#endif
+
+    /** Returns true if the two distributions will produce the same
+        sequence of values, given equal generators. */
+    friend bool operator==(const negative_binomial_distribution& lhs,
+                           const negative_binomial_distribution& rhs)
+    {
+        return lhs._k == rhs._k && lhs._p == rhs._p;
+    }
+    /** Returns true if the two distributions could produce different
+        sequences of values, given equal generators. */
+    friend bool operator!=(const negative_binomial_distribution& lhs,
+                           const negative_binomial_distribution& rhs)
+    {
+        return !(lhs == rhs);
+    }
+
+private:
+
+    /// @cond \show_private
+
+    template<class CharT, class Traits>
+    void read(std::basic_istream<CharT, Traits>& is) {
+        param_type parm;
+        if(is >> parm) {
+            param(parm);
+        }
+    }
+
+    // parameters
+    IntType _k;
+    RealType _p;
+
+    /// @endcond
+};
+
+}
+
+}
+
+#endif