--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/epoc32/include/stdapis/boost/random/geometric_distribution.hpp Tue Mar 16 16:12:26 2010 +0000
@@ -0,0 +1,97 @@
+/* boost random/geometric_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: geometric_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_GEOMETRIC_DISTRIBUTION_HPP
+#define BOOST_RANDOM_GEOMETRIC_DISTRIBUTION_HPP
+
+#include <cmath> // std::log
+#include <cassert>
+#include <iostream>
+#include <boost/random/uniform_01.hpp>
+
+namespace boost {
+
+#if defined(__GNUC__) && (__GNUC__ < 3)
+// Special gcc workaround: gcc 2.95.x ignores using-declarations
+// in template classes (confirmed by gcc author Martin v. Loewis)
+ using std::log;
+#endif
+
+// geometric distribution: p(i) = (1-p) * pow(p, i-1) (integer)
+template<class IntType = int, class RealType = double>
+class geometric_distribution
+{
+public:
+ typedef RealType input_type;
+ typedef IntType result_type;
+
+ explicit geometric_distribution(const RealType& p = RealType(0.5))
+ : _p(p)
+ {
+ assert(RealType(0) < p && p < RealType(1));
+ init();
+ }
+
+ // compiler-generated copy ctor and assignment operator are fine
+
+ RealType p() const { return _p; }
+ void reset() { }
+
+ template<class Engine>
+ result_type operator()(Engine& eng)
+ {
+#ifndef BOOST_NO_STDC_NAMESPACE
+ using std::log;
+ using std::floor;
+#endif
+ return IntType(floor(log(RealType(1)-eng()) / _log_p)) + IntType(1);
+ }
+
+#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 geometric_distribution& gd)
+ {
+ os << gd._p;
+ return os;
+ }
+
+ template<class CharT, class Traits>
+ friend std::basic_istream<CharT,Traits>&
+ operator>>(std::basic_istream<CharT,Traits>& is, geometric_distribution& gd)
+ {
+ is >> std::ws >> gd._p;
+ gd.init();
+ return is;
+ }
+#endif
+
+private:
+ void init()
+ {
+#ifndef BOOST_NO_STDC_NAMESPACE
+ using std::log;
+#endif
+ _log_p = log(_p);
+ }
+
+ RealType _p;
+ RealType _log_p;
+};
+
+} // namespace boost
+
+#endif // BOOST_RANDOM_GEOMETRIC_DISTRIBUTION_HPP
+