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 #include <boost/mpl/bool_fwd.hpp>
13 
14 namespace boost { namespace serialization {
15 
16 /// the base class for serialization wrappers
17 ///
18 /// wrappers need to be treated differently at various places in the serialization library,
19 /// e.g. saving of non-const wrappers has to be possible. Since partial specialization
20 // is not supported by all compilers, we derive all wrappers from wrapper_traits.
21 
22 template<
23     class T,
24     int Level = object_serializable,
25     int Tracking = track_never,
26     unsigned int Version = 0,
27     class ETII = extended_type_info_impl< T >
28 >
29 struct wrapper_traits :
30     public traits<T,Level,Tracking,Version,ETII,mpl::true_>
31 {};
32 
33 template<class T>
34 struct is_wrapper_impl :
35     boost::mpl::eval_if<
36       boost::is_base_and_derived<basic_traits,T>,
37       boost::mpl::true_,
38       boost::mpl::false_
39     >::type
40 {};
41 
42 template<class T>
43 struct is_wrapper {
44     typedef typename is_wrapper_impl<const T>::type type;
45 };
46 
47 } // serialization
48 } // boost
49 
50 // A macro to define that a class is a wrapper
51 #define BOOST_CLASS_IS_WRAPPER(T)                       \
52 namespace boost {                                       \
53 namespace serialization {                               \
54 template<>                                              \
55 struct is_wrapper_impl<const T> : boost::mpl::true_ {}; \
56 }                                                       \
57 }                                                       \
58 /**/
59 
60 #endif //BOOST_SERIALIZATION_WRAPPER_HPP
61