boost/serialization/level.hpp

   1 #ifndef BOOST_SERIALIZATION_LEVEL_HPP
   2 #define BOOST_SERIALIZATION_LEVEL_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 // level.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/detail/workaround.hpp>
  21
  22 #include <boost/type_traits/is_fundamental.hpp>
  23 #include <boost/type_traits/is_enum.hpp>
  24 #include <boost/type_traits/is_array.hpp>
  25 #include <boost/type_traits/is_class.hpp>
  26 #include <boost/type_traits/is_base_and_derived.hpp>
  27
  28 #include <boost/mpl/eval_if.hpp>
  29 #include <boost/mpl/int.hpp>
  30 #include <boost/mpl/integral_c.hpp>
  31 #include <boost/mpl/integral_c_tag.hpp>
  32 #include <boost/mpl/aux_/nttp_decl.hpp>
  33
  34 #include <boost/serialization/level_enum.hpp>
  35
  36 namespace boost {
  37 namespace serialization {
  38
  39 struct basic_traits;
  40
  41 // default serialization implementation level
  42 template<class T>
  43 struct implementation_level {
  44     template<class U>
  45     struct traits_class_level {
  46         typedef  BOOST_DEDUCED_TYPENAME U::level type;
  47     };
  48
  49     typedef mpl::integral_c_tag tag;
  50     // note: at least one compiler complained w/o the full qualification
  51     // on basic traits below
  52     typedef
  53         BOOST_DEDUCED_TYPENAME mpl::eval_if<
  54             is_base_and_derived<boost::serialization::basic_traits, T>,
  55             traits_class_level<T>,
  56         //else
  57         BOOST_DEDUCED_TYPENAME mpl::eval_if<
  58             is_fundamental<T>,
  59             mpl::int_<primitive_type>,
  60         //else
  61         BOOST_DEDUCED_TYPENAME mpl::eval_if<
  62             is_class<T>,
  63             mpl::int_<object_class_info>,
  64         //else
  65         BOOST_DEDUCED_TYPENAME mpl::eval_if<
  66             is_array<T>,
  67             #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x560))
  68                 mpl::int_<not_serializable>,
  69             #else
  70                 mpl::int_<object_serializable>,
  71             #endif
  72         //else
  73         BOOST_DEDUCED_TYPENAME mpl::eval_if<
  74             is_enum<T>,
  75             //#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x560))
  76             //    mpl::int_<not_serializable>,
  77             //#else
  78                 mpl::int_<primitive_type>,
  79             //#endif
  80         //else
  81             mpl::int_<not_serializable>
  82         >
  83         >
  84         >
  85         >
  86         >::type type;
  87         // vc 7.1 doesn't like enums here
  88     BOOST_STATIC_CONSTANT(int, value = implementation_level::type::value);
  89 };
  90
  91
  92 template<class T, BOOST_MPL_AUX_NTTP_DECL(int, L) >
  93 inline bool operator>=(implementation_level<T> t, enum level_type l)
  94 {
  95     return t.value >= (int)l;
  96 }
  97
  98 } // namespace serialization
  99 } // namespace boost
 100
 101 // specify the level of serialization implementation for the class
 102 // require that class info saved when versioning is used
 103 #define BOOST_CLASS_IMPLEMENTATION(T, E)                 \
 104     namespace boost {                                    \
 105     namespace serialization {                            \
 106     template <>                                          \
 107     struct implementation_level< T >                     \
 108     {                                                    \
 109         typedef mpl::integral_c_tag tag;                 \
 110         typedef mpl::int_< E > type;                     \
 111         BOOST_STATIC_CONSTANT(                           \
 112             int,                                         \
 113             value = implementation_level::type::value    \
 114         );                                               \
 115     };                                                   \
 116     }                                                    \
 117     }
 118     /**/
 119
 120 #endif // BOOST_SERIALIZATION_LEVEL_HPP