boost/serialization/type_info_implementation.hpp

   1 #ifndef BOOST_SERIALIZATION_TYPE_INFO_IMPLEMENTATION_HPP
   2 #define BOOST_SERIALIZATION_TYPE_INFO_IMPLEMENTATION_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 // type_info_implementation.hpp: interface for portable version of type_info
  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
  20 #include <boost/config.hpp>
  21 #include <boost/detail/workaround.hpp>
  22
  23 #include <boost/static_assert.hpp>
  24 #include <boost/mpl/eval_if.hpp>
  25 #include <boost/mpl/identity.hpp>
  26 #include <boost/type_traits/is_base_and_derived.hpp>
  27 #include <boost/serialization/traits.hpp>
  28
  29 namespace boost {
  30 namespace serialization {
  31
  32 // note that T and const T are folded into const T so that
  33 // there is only one table entry per type
  34 template<class T>
  35 struct type_info_implementation {
  36     template<class U>
  37     struct traits_class_typeinfo_implementation {
  38       typedef typename U::type_info_implementation::type type;
  39     };
  40     // note: at least one compiler complained w/o the full qualification
  41     // on basic traits below
  42     typedef
  43         typename mpl::eval_if<
  44             is_base_and_derived<boost::serialization::basic_traits, T>,
  45             traits_class_typeinfo_implementation< T >,
  46         //else
  47             mpl::identity<
  48                 typename extended_type_info_impl< T >::type
  49             >
  50         >::type type;
  51 };
  52
  53 } // namespace serialization
  54 } // namespace boost
  55
  56 // define a macro to assign a particular derivation of extended_type_info
  57 // to a specified a class.
  58 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x560))
  59 #define BOOST_CLASS_TYPE_INFO(T, ETI)              \
  60 namespace boost {                                  \
  61 namespace serialization {                          \
  62 template<>                                         \
  63 struct type_info_implementation< T > {             \
  64     typedef const ETI type;                        \
  65 };                                                 \
  66 }                                                  \
  67 }                                                  \
  68 /**/
  69 #else
  70 #define BOOST_CLASS_TYPE_INFO(T, ETI)              \
  71 namespace boost {                                  \
  72 namespace serialization {                          \
  73 template<>                                         \
  74 struct type_info_implementation< T > {             \
  75     typedef ETI type;                              \
  76 };                                                 \
  77 template<>                                         \
  78 struct type_info_implementation< const T > {       \
  79     typedef ETI type;                              \
  80 };                                                 \
  81 }                                                  \
  82 }                                                  \
  83 /**/
  84 #endif
  85
  86 #endif /// BOOST_SERIALIZATION_TYPE_INFO_IMPLEMENTATION_HPP