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
35namespace boost {
36namespace serialization {
37
38// common base class used to detect appended traits class
39struct basic_traits {};
40
41template <class T>
42struct extended_type_info_impl;
43
44template<
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>
52struct 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

source code of include/boost/serialization/traits.hpp