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1 | #ifndef BOOST_SERIALIZATION_VERSION_HPP |
2 | #define BOOST_SERIALIZATION_VERSION_HPP | |
3 | ||
4 | // MS compatible compilers support #pragma once | |
5 | #if defined(_MSC_VER) | |
6 | # pragma once | |
7 | #endif | |
8 | ||
9 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
10 | // version.hpp: | |
11 | ||
12 | // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . | |
13 | // Use, modification and distribution is subject to the Boost Software | |
14 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
15 | // http://www.boost.org/LICENSE_1_0.txt) | |
16 | ||
17 | // See http://www.boost.org for updates, documentation, and revision history. | |
18 | ||
19 | #include <boost/config.hpp> | |
20 | #include <boost/mpl/assert.hpp> | |
21 | #include <boost/mpl/int.hpp> | |
22 | #include <boost/mpl/eval_if.hpp> | |
23 | #include <boost/mpl/identity.hpp> | |
24 | #include <boost/mpl/integral_c_tag.hpp> | |
25 | ||
26 | #include <boost/type_traits/is_base_and_derived.hpp> | |
27 | ||
28 | namespace boost { | |
29 | namespace serialization { | |
30 | ||
31 | struct basic_traits; | |
32 | ||
33 | // default version number is 0. Override with higher version | |
34 | // when class definition changes. | |
35 | template<class T> | |
36 | struct version | |
37 | { | |
38 | template<class U> | |
39 | struct traits_class_version { | |
40 | typedef typename U::version type; | |
41 | }; | |
42 | ||
43 | typedef mpl::integral_c_tag tag; | |
44 | // note: at least one compiler complained w/o the full qualification | |
45 | // on basic traits below | |
46 | typedef | |
47 | typename mpl::eval_if< | |
48 | is_base_and_derived<boost::serialization::basic_traits,T>, | |
49 | traits_class_version< T >, | |
50 | mpl::int_<0> | |
51 | >::type type; | |
52 | BOOST_STATIC_CONSTANT(int, value = version::type::value); | |
53 | }; | |
54 | ||
55 | #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION | |
56 | template<class T> | |
57 | const int version<T>::value; | |
58 | #endif | |
59 | ||
60 | } // namespace serialization | |
61 | } // namespace boost | |
62 | ||
63 | /* note: at first it seemed that this would be a good place to trap | |
64 | * as an error an attempt to set a version # for a class which doesn't | |
65 | * save its class information (including version #) in the archive. | |
66 | * However, this imposes a requirement that the version be set after | |
67 | * the implemention level which would be pretty confusing. If this | |
68 | * is to be done, do this check in the input or output operators when | |
69 | * ALL the serialization traits are available. Included the implementation | |
70 | * here with this comment as a reminder not to do this! | |
71 | */ | |
72 | //#include <boost/serialization/level.hpp> | |
73 | //#include <boost/mpl/equal_to.hpp> | |
74 | ||
75 | #include <boost/mpl/less.hpp> | |
76 | #include <boost/mpl/comparison.hpp> | |
77 | ||
78 | // specify the current version number for the class | |
79 | // version numbers limited to 8 bits !!! | |
80 | #define BOOST_CLASS_VERSION(T, N) \ | |
81 | namespace boost { \ | |
82 | namespace serialization { \ | |
83 | template<> \ | |
84 | struct version<T > \ | |
85 | { \ | |
86 | typedef mpl::int_<N> type; \ | |
87 | typedef mpl::integral_c_tag tag; \ | |
88 | BOOST_STATIC_CONSTANT(int, value = version::type::value); \ | |
89 | BOOST_MPL_ASSERT(( \ | |
90 | boost::mpl::less< \ | |
91 | boost::mpl::int_<N>, \ | |
92 | boost::mpl::int_<256> \ | |
93 | > \ | |
94 | )); \ | |
95 | /* \ | |
96 | BOOST_MPL_ASSERT(( \ | |
97 | mpl::equal_to< \ | |
98 | :implementation_level<T >, \ | |
99 | mpl::int_<object_class_info> \ | |
100 | >::value \ | |
101 | )); \ | |
102 | */ \ | |
103 | }; \ | |
104 | } \ | |
105 | } | |
106 | ||
107 | #endif // BOOST_SERIALIZATION_VERSION_HPP |