boost/serialization/wrapper.hpp

   1 #ifndef BOOST_SERIALIZATION_WRAPPER_HPP
   2 #define BOOST_SERIALIZATION_WRAPPER_HPP
   3
   4 // (C) Copyright 2005-2006 Matthias Troyer
   5 // Use, modification and distribution is subject to the Boost Software
   6 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #include <boost/serialization/traits.hpp>
  10 #include <boost/type_traits/is_base_and_derived.hpp>
  11 #include <boost/mpl/eval_if.hpp>
  12
  13 namespace boost { namespace serialization {
  14
  15 /// the base class for serialization wrappers
  16 ///
  17 /// wrappers need to be treated differently at various places in the serialization library,
  18 /// e.g. saving of non-const wrappers has to be possible. Since partial specialization
  19 // is not supported by all compilers, we derive all wrappers from wrapper_traits.
  20
  21 template<
  22     class T,
  23     int Level = object_serializable,
  24     int Tracking = track_never,
  25     unsigned int Version = 0,
  26     class ETII = extended_type_info_impl< T >
  27 >
  28 struct wrapper_traits : public traits<T,Level,Tracking,Version,ETII,mpl::true_>
  29 {};
  30
  31 /// the is_wrapper type traits class.
  32
  33 namespace detail {
  34 template <class T>
  35 struct is_wrapper_member
  36 {
  37   typedef BOOST_DEDUCED_TYPENAME T::is_wrapper type;
  38 };
  39
  40 }
  41
  42
  43 template<class T>
  44 struct is_wrapper
  45  : mpl::eval_if<
  46       is_base_and_derived<basic_traits,T>,
  47       detail::is_wrapper_member<T>,
  48       mpl::false_
  49     >::type
  50 {};
  51
  52 } } // end namespace boost::serialization
  53
  54 // A macro to define that a class is a wrapper
  55 #define BOOST_CLASS_IS_WRAPPER(T)            \
  56 namespace boost {                            \
  57 namespace serialization {                    \
  58 template<>                                   \
  59 struct is_wrapper< T > : mpl::true_ {};      \
  60 }}
  61
  62
  63 #endif //BOOST_SERIALIZATION_WRAPPER_HPP