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+/* boost random/uniform_01.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: uniform_01.hpp 60755 2010-03-22 00:45:06Z steven_watanabe $
+ *
+ * Revision history
+ *  2001-02-18  moved to individual header files
+ */
+
+#ifndef BOOST_RANDOM_UNIFORM_01_HPP
+#define BOOST_RANDOM_UNIFORM_01_HPP
+
+#include <iostream>
+#include <boost/config.hpp>
+#include <boost/limits.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/random/detail/config.hpp>
+#include <boost/random/detail/pass_through_engine.hpp>
+
+#include <boost/random/detail/disable_warnings.hpp>
+
+namespace boost {
+
+#ifdef BOOST_RANDOM_DOXYGEN
+
+/**
+ * The distribution function uniform_01 models a \random_distribution.
+ * On each invocation, it returns a random floating-point value
+ * uniformly distributed in the range [0..1).
+ *
+ * The template parameter RealType shall denote a float-like value type
+ * with support for binary operators +, -, and /.
+ *
+ * Note: The current implementation is buggy, because it may not fill
+ * all of the mantissa with random bits. I'm unsure how to fill a
+ * (to-be-invented) @c boost::bigfloat class with random bits efficiently.
+ * It's probably time for a traits class.
+ */
+template<class RealType = double>
+class uniform_01
+{
+public:
+  typedef RealType input_type;
+  typedef RealType result_type;
+  result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const;
+  result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const;
+  void reset();
+
+  template<class Engine>
+  result_type operator()(Engine& eng);
+
+#ifndef BOOST_RANDOM_NO_STREAM_OPERATORS
+  template<class CharT, class Traits>
+  friend std::basic_ostream<CharT,Traits>&
+  operator<<(std::basic_ostream<CharT,Traits>& os, const new_uniform_01&)
+  {
+    return os;
+  }
+
+  template<class CharT, class Traits>
+  friend std::basic_istream<CharT,Traits>&
+  operator>>(std::basic_istream<CharT,Traits>& is, new_uniform_01&)
+  {
+    return is;
+  }
+#endif
+};
+
+#else
+
+namespace detail {
+
+template<class RealType>
+class new_uniform_01
+{
+public:
+  typedef RealType input_type;
+  typedef RealType result_type;
+  // compiler-generated copy ctor and copy assignment are fine
+  result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return result_type(0); }
+  result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return result_type(1); }
+  void reset() { }
+
+  template<class Engine>
+  result_type operator()(Engine& eng) {
+    for (;;) {
+      typedef typename Engine::result_type base_result;
+      result_type factor = result_type(1) /
+              (result_type((eng.max)()-(eng.min)()) +
+               result_type(std::numeric_limits<base_result>::is_integer ? 1 : 0));
+      result_type result = result_type(eng() - (eng.min)()) * factor;
+      if (result < result_type(1))
+        return result;
+    }
+  }
+
+#ifndef BOOST_RANDOM_NO_STREAM_OPERATORS
+  template<class CharT, class Traits>
+  friend std::basic_ostream<CharT,Traits>&
+  operator<<(std::basic_ostream<CharT,Traits>& os, const new_uniform_01&)
+  {
+    return os;
+  }
+
+  template<class CharT, class Traits>
+  friend std::basic_istream<CharT,Traits>&
+  operator>>(std::basic_istream<CharT,Traits>& is, new_uniform_01&)
+  {
+    return is;
+  }
+#endif
+};
+
+template<class UniformRandomNumberGenerator, class RealType>
+class backward_compatible_uniform_01
+{
+  typedef boost::random::detail::ptr_helper<UniformRandomNumberGenerator> traits;
+  typedef boost::random::detail::pass_through_engine<UniformRandomNumberGenerator> internal_engine_type;
+public:
+  typedef UniformRandomNumberGenerator base_type;
+  typedef RealType result_type;
+
+  BOOST_STATIC_CONSTANT(bool, has_fixed_range = false);
+
+#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 backward_compatible_uniform_01(typename traits::rvalue_type rng)
+    : _rng(rng),
+      _factor(result_type(1) /
+              (result_type((_rng.max)()-(_rng.min)()) +
+               result_type(std::numeric_limits<base_result>::is_integer ? 1 : 0)))
+  {
+  }
+  // compiler-generated copy ctor and copy assignment are fine
+
+  result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return result_type(0); }
+  result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return result_type(1); }
+  typename traits::value_type& base() { return _rng.base(); }
+  const typename traits::value_type& base() const { return _rng.base(); }
+  void reset() { }
+
+  result_type operator()() {
+    for (;;) {
+      result_type result = result_type(_rng() - (_rng.min)()) * _factor;
+      if (result < result_type(1))
+        return result;
+    }
+  }
+
+#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 backward_compatible_uniform_01& u)
+  {
+    os << u._rng;
+    return os;
+  }
+
+  template<class CharT, class Traits>
+  friend std::basic_istream<CharT,Traits>&
+  operator>>(std::basic_istream<CharT,Traits>& is, backward_compatible_uniform_01& u)
+  {
+    is >> u._rng;
+    return is;
+  }
+#endif
+
+private:
+  typedef typename internal_engine_type::result_type base_result;
+  internal_engine_type _rng;
+  result_type _factor;
+};
+
+#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
+//  A definition is required even for integral static constants
+template<class UniformRandomNumberGenerator, class RealType>
+const bool backward_compatible_uniform_01<UniformRandomNumberGenerator, RealType>::has_fixed_range;
+#endif
+
+template<class UniformRandomNumberGenerator>
+struct select_uniform_01
+{
+  template<class RealType>
+  struct apply
+  {
+    typedef backward_compatible_uniform_01<UniformRandomNumberGenerator, RealType> type;
+  };
+};
+
+template<>
+struct select_uniform_01<float>
+{
+  template<class RealType>
+  struct apply
+  {
+    typedef new_uniform_01<float> type;
+  };
+};
+
+template<>
+struct select_uniform_01<double>
+{
+  template<class RealType>
+  struct apply
+  {
+    typedef new_uniform_01<double> type;
+  };
+};
+
+template<>
+struct select_uniform_01<long double>
+{
+  template<class RealType>
+  struct apply
+  {
+    typedef new_uniform_01<long double> type;
+  };
+};
+
+}
+
+// Because it is so commonly used: uniform distribution on the real [0..1)
+// range.  This allows for specializations to avoid a costly int -> float
+// conversion plus float multiplication
+template<class UniformRandomNumberGenerator = double, class RealType = double>
+class uniform_01
+  : public detail::select_uniform_01<UniformRandomNumberGenerator>::BOOST_NESTED_TEMPLATE apply<RealType>::type
+{
+  typedef typename detail::select_uniform_01<UniformRandomNumberGenerator>::BOOST_NESTED_TEMPLATE apply<RealType>::type impl_type;
+  typedef boost::random::detail::ptr_helper<UniformRandomNumberGenerator> traits;
+public:
+
+  uniform_01() {}
+
+  explicit uniform_01(typename traits::rvalue_type rng)
+    : impl_type(rng)
+  {
+  }
+
+#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 uniform_01& u)
+  {
+    os << static_cast<const impl_type&>(u);
+    return os;
+  }
+
+  template<class CharT, class Traits>
+  friend std::basic_istream<CharT,Traits>&
+  operator>>(std::basic_istream<CharT,Traits>& is, uniform_01& u)
+  {
+    is >> static_cast<impl_type&>(u);
+    return is;
+  }
+#endif
+};
+
+#endif
+
+} // namespace boost
+
+#include <boost/random/detail/enable_warnings.hpp>
+
+#endif // BOOST_RANDOM_UNIFORM_01_HPP