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1 | /* boost random/detail/uniform_int_float.hpp header file |
2 | * | |
3 | * Copyright Jens Maurer 2000-2001 | |
4 | * Copyright Steven Watanabe 2011 | |
5 | * Distributed under the Boost Software License, Version 1.0. (See | |
6 | * accompanying file LICENSE_1_0.txt or copy at | |
7 | * http://www.boost.org/LICENSE_1_0.txt) | |
8 | * | |
9 | * See http://www.boost.org for most recent version including documentation. | |
10 | * | |
11 | * $Id$ | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP | |
16 | #define BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP | |
17 | ||
18 | #include <boost/limits.hpp> | |
19 | #include <boost/config.hpp> | |
20 | #include <boost/integer.hpp> | |
21 | #include <boost/random/detail/config.hpp> | |
22 | #include <boost/random/detail/generator_bits.hpp> | |
23 | ||
24 | #include <boost/random/detail/disable_warnings.hpp> | |
25 | ||
26 | namespace boost { | |
27 | namespace random { | |
28 | namespace detail { | |
29 | ||
30 | template<class URNG> | |
31 | class uniform_int_float | |
32 | { | |
33 | public: | |
34 | typedef URNG base_type; | |
35 | typedef typename base_type::result_type base_result; | |
36 | ||
37 | typedef typename boost::uint_t< | |
38 | (std::numeric_limits<boost::uintmax_t>::digits < | |
39 | std::numeric_limits<base_result>::digits)? | |
40 | std::numeric_limits<boost::uintmax_t>::digits : | |
41 | std::numeric_limits<base_result>::digits | |
42 | >::fast result_type; | |
43 | ||
44 | uniform_int_float(base_type& rng) | |
45 | : _rng(rng) {} | |
46 | ||
47 | static result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () | |
48 | { return 0; } | |
49 | static result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () | |
50 | { | |
51 | std::size_t digits = std::numeric_limits<result_type>::digits; | |
52 | if(detail::generator_bits<URNG>::value() < digits) { | |
53 | digits = detail::generator_bits<URNG>::value(); | |
54 | } | |
55 | return (result_type(2) << (digits - 1)) - 1; | |
56 | } | |
57 | base_type& base() { return _rng; } | |
58 | const base_type& base() const { return _rng; } | |
59 | ||
60 | result_type operator()() | |
61 | { | |
62 | base_result range = static_cast<base_result>((max)())+1; | |
63 | return static_cast<result_type>(_rng() * range); | |
64 | } | |
65 | ||
66 | private: | |
67 | base_type& _rng; | |
68 | }; | |
69 | ||
70 | } // namespace detail | |
71 | } // namespace random | |
72 | } // namespace boost | |
73 | ||
74 | #include <boost/random/detail/enable_warnings.hpp> | |
75 | ||
76 | #endif // BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP |