source: NonGTP/Boost/boost/random/uniform_real.hpp @ 857

Revision 857, 2.4 KB checked in by igarcia, 19 years ago (diff)
Line 
1/* boost random/uniform_real.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_real.hpp,v 1.17 2005/01/28 15:04:17 dgregor Exp $
11 *
12 * Revision history
13 *  2001-04-08  added min<max assertion (N. Becker)
14 *  2001-02-18  moved to individual header files
15 */
16
17#ifndef BOOST_RANDOM_UNIFORM_REAL_HPP
18#define BOOST_RANDOM_UNIFORM_REAL_HPP
19
20#include <cassert>
21#include <iostream>
22#include <boost/config.hpp>
23#include <boost/limits.hpp>
24#include <boost/static_assert.hpp>
25
26namespace boost {
27
28// uniform distribution on a real range
29template<class RealType = double>
30class uniform_real
31{
32public:
33  typedef RealType input_type;
34  typedef RealType result_type;
35
36  explicit uniform_real(RealType min = RealType(0),
37                        RealType max = RealType(1))
38    : _min(min), _max(max)
39  {
40#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
41    BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer);
42#endif
43    assert(min < max);
44  }
45
46  // compiler-generated copy ctor and assignment operator are fine
47
48  result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; }
49  result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; }
50  void reset() { }
51
52  template<class Engine>
53  result_type operator()(Engine& eng) {
54    return static_cast<result_type>(eng() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION())
55           / static_cast<result_type>(eng.max BOOST_PREVENT_MACRO_SUBSTITUTION() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION())
56           * (_max - _min) + _min;
57  }
58
59#if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
60  template<class CharT, class Traits>
61  friend std::basic_ostream<CharT,Traits>&
62  operator<<(std::basic_ostream<CharT,Traits>& os, const uniform_real& ud)
63  {
64    os << ud._min << " " << ud._max;
65    return os;
66  }
67
68  template<class CharT, class Traits>
69  friend std::basic_istream<CharT,Traits>&
70  operator>>(std::basic_istream<CharT,Traits>& is, uniform_real& ud)
71  {
72    is >> std::ws >> ud._min >> std::ws >> ud._max;
73    return is;
74  }
75#endif
76
77private:
78  RealType _min, _max;
79};
80
81} // namespace boost
82
83#endif // BOOST_RANDOM_UNIFORM_REAL_HPP
Note: See TracBrowser for help on using the repository browser.