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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2005-2013. Distributed under the Boost | |
4 | // Software License, Version 1.0. (See accompanying file | |
5 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | // See http://www.boost.org/libs/container for documentation. | |
8 | // | |
9 | ////////////////////////////////////////////////////////////////////////////// | |
10 | // | |
11 | // This code comes from N1953 document by Howard E. Hinnant | |
12 | // | |
13 | ////////////////////////////////////////////////////////////////////////////// | |
14 | ||
15 | ||
16 | #ifndef BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP | |
17 | #define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP | |
18 | ||
19 | #ifndef BOOST_CONFIG_HPP | |
20 | # include <boost/config.hpp> | |
21 | #endif | |
22 | ||
23 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
24 | # pragma once | |
25 | #endif | |
26 | ||
27 | #include <boost/container/detail/config_begin.hpp> | |
28 | #include <boost/container/detail/workaround.hpp> | |
29 | ||
30 | #include <boost/container/detail/mpl.hpp> | |
31 | #include <boost/container/detail/type_traits.hpp> | |
32 | ||
33 | namespace boost{ | |
34 | namespace container { | |
11fdf7f2 | 35 | namespace dtl { |
7c673cae FG |
36 | |
37 | template <class T, unsigned V> | |
38 | struct version_type | |
11fdf7f2 | 39 | : public dtl::integral_constant<unsigned, V> |
7c673cae FG |
40 | { |
41 | typedef T type; | |
7c673cae FG |
42 | }; |
43 | ||
44 | namespace impl{ | |
45 | ||
7c673cae | 46 | template <class T> |
92f5a8d4 | 47 | struct extract_version |
7c673cae | 48 | { |
92f5a8d4 | 49 | typedef typename T::version type; |
7c673cae FG |
50 | }; |
51 | ||
52 | template <class T> | |
53 | struct has_version | |
54 | { | |
55 | private: | |
56 | struct two {char _[2];}; | |
57 | template <class U> static two test(...); | |
58 | template <class U> static char test(const typename U::version*); | |
59 | public: | |
60 | static const bool value = sizeof(test<T>(0)) == 1; | |
61 | void dummy(){} | |
62 | }; | |
63 | ||
64 | template <class T, bool = has_version<T>::value> | |
65 | struct version | |
66 | { | |
67 | static const unsigned value = 1; | |
68 | }; | |
69 | ||
70 | template <class T> | |
71 | struct version<T, true> | |
72 | { | |
92f5a8d4 | 73 | static const unsigned value = extract_version<T>::type::value; |
7c673cae FG |
74 | }; |
75 | ||
76 | } //namespace impl | |
77 | ||
78 | template <class T> | |
79 | struct version | |
11fdf7f2 | 80 | : public dtl::integral_constant<unsigned, impl::version<T>::value> |
7c673cae FG |
81 | {}; |
82 | ||
83 | template<class T, unsigned N> | |
84 | struct is_version | |
85 | { | |
86 | static const bool value = | |
87 | is_same< typename version<T>::type, integral_constant<unsigned, N> >::value; | |
88 | }; | |
89 | ||
11fdf7f2 | 90 | } //namespace dtl { |
7c673cae | 91 | |
11fdf7f2 TL |
92 | typedef dtl::integral_constant<unsigned, 0> version_0; |
93 | typedef dtl::integral_constant<unsigned, 1> version_1; | |
94 | typedef dtl::integral_constant<unsigned, 2> version_2; | |
7c673cae FG |
95 | |
96 | } //namespace container { | |
97 | } //namespace boost{ | |
98 | ||
99 | #include <boost/container/detail/config_end.hpp> | |
100 | ||
101 | #endif //#define BOOST_CONTAINER_DETAIL_VERSION_TYPE_HPP |