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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) && (_MSC_VER >= 1020)
   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 BOOST_DEDUCED_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         BOOST_DEDUCED_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