epoc32/include/stdapis/boost/random/detail/uniform_int_float.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:27:01 +0100
branchSymbian2
changeset 3 e1b950c65cb4
permissions -rw-r--r--
Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
     1 /* boost random/detail/uniform_int_float.hpp header file
     2  *
     3  * Copyright Jens Maurer 2000-2001
     4  * Distributed under the Boost Software License, Version 1.0. (See
     5  * accompanying file LICENSE_1_0.txt or copy at
     6  * http://www.boost.org/LICENSE_1_0.txt)
     7  *
     8  * See http://www.boost.org for most recent version including documentation.
     9  *
    10  * $Id: uniform_int_float.hpp,v 1.3 2004/07/27 03:43:32 dgregor Exp $
    11  *
    12  */
    13 
    14 #ifndef BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
    15 #define BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
    16 
    17 #include <boost/config.hpp>
    18 #include <boost/random/uniform_01.hpp>
    19 
    20 
    21 namespace boost {
    22 namespace random {
    23 namespace detail {
    24 
    25 template<class UniformRandomNumberGenerator, class IntType = unsigned long>
    26 class uniform_int_float
    27 {
    28 public:
    29   typedef UniformRandomNumberGenerator base_type;
    30   typedef IntType result_type;
    31 
    32   uniform_int_float(base_type rng, IntType min = 0, IntType max = 0xffffffff)
    33     : _rng(rng), _min(min), _max(max)
    34   {
    35     init();
    36   }
    37 
    38   result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; }
    39   result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; }
    40   base_type& base() { return _rng.base(); }
    41   const base_type& base() const { return _rng.base(); }
    42 
    43   result_type operator()()
    44   {
    45     return static_cast<IntType>(_rng() * _range) + _min;
    46   }
    47 
    48 #if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
    49   template<class CharT, class Traits>
    50   friend std::basic_ostream<CharT,Traits>&
    51   operator<<(std::basic_ostream<CharT,Traits>& os, const uniform_int_float& ud)
    52   {
    53     os << ud._min << " " << ud._max;
    54     return os;
    55   }
    56 
    57   template<class CharT, class Traits>
    58   friend std::basic_istream<CharT,Traits>&
    59   operator>>(std::basic_istream<CharT,Traits>& is, uniform_int_float& ud)
    60   {
    61     is >> std::ws >> ud._min >> std::ws >> ud._max;
    62     ud.init();
    63     return is;
    64   }
    65 #endif
    66 
    67 private:
    68   void init()
    69   {
    70     _range = static_cast<base_result>(_max-_min)+1;
    71   }
    72 
    73   typedef typename base_type::result_type base_result;
    74   uniform_01<base_type> _rng;
    75   result_type _min, _max;
    76   base_result _range;
    77 };
    78 
    79 
    80 } // namespace detail
    81 } // namespace random
    82 } // namespace boost
    83 
    84 #endif // BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP