boost/serialization/traits.hpp

   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) && (_MSC_VER >= 1020)
   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.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 BOOST_DEDUCED_TYPENAME mpl::int_<Level> level;
  56     typedef BOOST_DEDUCED_TYPENAME mpl::int_<Tracking> tracking;
  57     typedef BOOST_DEDUCED_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