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
28namespace boost {
29namespace serialization {
30
31struct basic_traits;
32
33// default version number is 0. Override with higher version
34// when class definition changes.
35template<class T>
36struct 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
56template<class T>
57const 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) \
81namespace boost { \
82namespace serialization { \
83template<> \
84struct 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
108

source code of boost/boost/serialization/version.hpp