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 | |
73 | #include <boost/mpl/less.hpp> |
74 | #include <boost/mpl/comparison.hpp> |
75 | |
76 | // specify the current version number for the class |
77 | // version numbers limited to 8 bits !!! |
78 | #define BOOST_CLASS_VERSION(T, N) \ |
79 | namespace boost { \ |
80 | namespace serialization { \ |
81 | template<> \ |
82 | struct version<T > \ |
83 | { \ |
84 | typedef mpl::int_<N> type; \ |
85 | typedef mpl::integral_c_tag tag; \ |
86 | BOOST_STATIC_CONSTANT(int, value = version::type::value); \ |
87 | BOOST_MPL_ASSERT(( \ |
88 | boost::mpl::less< \ |
89 | boost::mpl::int_<N>, \ |
90 | boost::mpl::int_<256> \ |
91 | > \ |
92 | )); \ |
93 | /* \ |
94 | BOOST_MPL_ASSERT(( \ |
95 | mpl::equal_to< \ |
96 | :implementation_level<T >, \ |
97 | mpl::int_<object_class_info> \ |
98 | >::value \ |
99 | )); \ |
100 | */ \ |
101 | }; \ |
102 | } \ |
103 | } |
104 | |
105 | #endif // BOOST_SERIALIZATION_VERSION_HPP |
106 | |