--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ossrv_pub/boost_apis/boost/random/exponential_distribution.hpp	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,81 @@
+/* boost random/exponential_distribution.hpp header file
+ *
+ * Copyright Jens Maurer 2000-2001
+ * 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: exponential_distribution.hpp,v 1.16 2004/07/27 03:43:32 dgregor Exp $
+ *
+ * Revision history
+ *  2001-02-18  moved to individual header files
+ */
+
+#ifndef BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP
+#define BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP
+
+#include <cmath>
+#include <cassert>
+#include <iostream>
+#include <boost/limits.hpp>
+#include <boost/static_assert.hpp>
+
+namespace boost {
+
+// exponential distribution: p(x) = lambda * exp(-lambda * x)
+template<class RealType = double>
+class exponential_distribution
+{
+public:
+  typedef RealType input_type;
+  typedef RealType result_type;
+
+#if !defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) && !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300)
+  BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer);
+#endif
+
+  explicit exponential_distribution(result_type lambda = result_type(1))
+    : _lambda(lambda) { assert(lambda > result_type(0)); }
+
+  // compiler-generated copy ctor and assignment operator are fine
+
+  result_type lambda() const { return _lambda; }
+
+  void reset() { }
+
+  template<class Engine>
+  result_type operator()(Engine& eng)
+  { 
+#ifndef BOOST_NO_STDC_NAMESPACE
+    using std::log;
+#endif
+    return -result_type(1) / _lambda * log(result_type(1)-eng());
+  }
+
+#if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
+  template<class CharT, class Traits>
+  friend std::basic_ostream<CharT,Traits>&
+  operator<<(std::basic_ostream<CharT,Traits>& os, const exponential_distribution& ed)
+  {
+    os << ed._lambda;
+    return os;
+  }
+
+  template<class CharT, class Traits>
+  friend std::basic_istream<CharT,Traits>&
+  operator>>(std::basic_istream<CharT,Traits>& is, exponential_distribution& ed)
+  {
+    is >> std::ws >> ed._lambda;
+    return is;
+  }
+#endif
+
+private:
+  result_type _lambda;
+};
+
+} // namespace boost
+
+#endif // BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP