1 #ifndef BOOST_SERIALIZATION_TRAITS_HPP
2 #define BOOST_SERIALIZATION_TRAITS_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 // traits.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 // This header is used to apply serialization traits to templates.  The
20 // standard system can't be used for platforms which don't support
21 // Partial Templlate Specialization.
22 
23 // The motivation for this is the Name-Value Pair (NVP) template.
24 // it has to work the same on all platforms in order for archives
25 // to be portable accross platforms.
26 
27 #include <boost/config.hpp>
28 #include <boost/static_assert.hpp>
29 
30 #include <boost/mpl/int.hpp>
31 #include <boost/mpl/bool_fwd.hpp>
32 #include <boost/serialization/level_enum.hpp>
33 #include <boost/serialization/tracking_enum.hpp>
34 
35 namespace boost {
36 namespace serialization {
37 
38 // common base class used to detect appended traits class
39 struct basic_traits {};
40 
41 template <class T>
42 struct extended_type_info_impl;
43 
44 template<
45     class T,
46     int Level,
47     int Tracking,
48     unsigned int Version = 0,
49     class ETII = extended_type_info_impl< T >,
50     class Wrapper = mpl::false_
51 >
52 struct traits : public basic_traits {
53     BOOST_STATIC_ASSERT(Version == 0 || Level >= object_class_info);
54     BOOST_STATIC_ASSERT(Tracking == track_never || Level >= object_serializable);
55     typedef typename mpl::int_<Level> level;
56     typedef typename mpl::int_<Tracking> tracking;
57     typedef typename mpl::int_<Version> version;
58     typedef ETII type_info_implementation;
59     typedef Wrapper is_wrapper;
60 };
61 
62 } // namespace serialization
63 } // namespace boost
64 
65 #endif // BOOST_SERIALIZATION_TRAITS_HPP
66