/* 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,v 1.18 2004/07/27 03:43:32 dgregor Exp $

  *

  * 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>

 namespace boost {

 // 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, class RealType = double>

 class uniform_01

 {

 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 uniform_01(base_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); }

   base_type& base() { return _rng; }

   const base_type& base() const { return _rng; }

   void reset() { }

   result_type operator()() {

     return result_type(_rng() - (_rng.min)()) * _factor;

   }

 #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 << u._rng;

     return os;

   }

   template<class CharT, class Traits>

   friend std::basic_istream<CharT,Traits>&

   operator>>(std::basic_istream<CharT,Traits>& is, uniform_01& u)

   {

     is >> u._rng;

     return is;

   }

 #endif

 private:

   typedef typename base_type::result_type base_result;

   base_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 uniform_01<UniformRandomNumberGenerator, RealType>::has_fixed_range;

 #endif

 } // namespace boost

 #endif // BOOST_RANDOM_UNIFORM_01_HPP