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
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) \
79namespace boost { \
80namespace serialization { \
81template<> \
82struct 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

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