boost/serialization/extended_type_info_typeid.hpp

   1 #ifndef BOOST_SERIALIZATION_EXTENDED_TYPE_INFO_TYPEID_HPP
   2 #define BOOST_SERIALIZATION_EXTENDED_TYPE_INFO_TYPEID_HPP
   3
   4 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
   5 // MS compatible compilers support #pragma once
   6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   7 # pragma once
   8 #endif
   9
  10 // extended_type_info_typeid.hpp: implementation for version that depends
  11 // on runtime typing (rtti - typeid) but uses a user specified string
  12 // as the portable class identifier.
  13
  14 // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
  15 // Use, modification and distribution is subject to the Boost Software
  16 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  17 // http://www.boost.org/LICENSE_1_0.txt)
  18
  19 //  See http://www.boost.org for updates, documentation, and revision history.
  20
  21 #include <typeinfo>
  22 #include <cstdarg>
  23 #include <cassert>
  24 #include <boost/config.hpp>
  25
  26 #include <boost/static_assert.hpp>
  27 #include <boost/serialization/static_warning.hpp>
  28 #include <boost/type_traits/is_polymorphic.hpp>
  29 #include <boost/type_traits/remove_const.hpp>
  30
  31 #include <boost/serialization/singleton.hpp>
  32 #include <boost/serialization/extended_type_info.hpp>
  33 #include <boost/serialization/factory.hpp>
  34
  35 #include <boost/config/abi_prefix.hpp> // must be the last header
  36 #ifdef BOOST_MSVC
  37 #  pragma warning(push)
  38 #  pragma warning(disable : 4251 4231 4660 4275)
  39 #endif
  40
  41 namespace boost {
  42 namespace serialization {
  43 namespace detail {
  44
  45 class BOOST_SERIALIZATION_DECL(BOOST_PP_EMPTY()) extended_type_info_typeid_0 :
  46     public extended_type_info
  47 {
  48 protected:
  49     const std::type_info * m_ti;
  50     extended_type_info_typeid_0();
  51     ~extended_type_info_typeid_0();
  52     void type_register(const std::type_info & ti);
  53     void type_unregister();
  54     const extended_type_info *
  55     get_extended_type_info(const std::type_info & ti) const;
  56 public:
  57     virtual bool
  58     is_less_than(const extended_type_info &rhs) const;
  59     virtual bool
  60     is_equal(const extended_type_info &rhs) const;
  61     const std::type_info & get_typeid() const {
  62         return *m_ti;
  63     }
  64 };
  65
  66 } // namespace detail
  67
  68 template<class T>
  69 class extended_type_info_typeid :
  70     public detail::extended_type_info_typeid_0,
  71     public singleton<extended_type_info_typeid<T> >
  72 {
  73 public:
  74     extended_type_info_typeid() :
  75         detail::extended_type_info_typeid_0()
  76     {
  77         type_register(typeid(T));
  78     }
  79     ~extended_type_info_typeid(){
  80         type_unregister();
  81     }
  82     // get the eti record for the true type of this record
  83     // relying upon standard type info implemenation (rtti)
  84     const extended_type_info *
  85     get_derived_extended_type_info(const T & t) const {
  86         // note: this implementation - based on usage of typeid (rtti)
  87         // only does something if the class has at least one virtual function.
  88         BOOST_STATIC_WARNING(boost::is_polymorphic<T>::value);
  89         return
  90             detail::extended_type_info_typeid_0::get_extended_type_info(
  91                 typeid(t)
  92             );
  93     }
  94     void * construct(unsigned int count, ...) const{
  95         // count up the arguments
  96         std::va_list ap;
  97         va_start(ap, count);
  98         switch(count){
  99         case 0:
 100             return factory<boost::remove_const<T>, 0>(ap);
 101         case 1:
 102             return factory<boost::remove_const<T>, 1>(ap);
 103         case 2:
 104             return factory<boost::remove_const<T>, 2>(ap);
 105         case 3:
 106             return factory<boost::remove_const<T>, 3>(ap);
 107         case 4:
 108             return factory<boost::remove_const<T>, 4>(ap);
 109         default:
 110             assert(false); // too many arguments
 111             // throw exception here?
 112             return NULL;
 113         }
 114     }
 115     void destroy(void const * const /* p */) const {
 116         // the only current usage of extended type info is in the
 117         // serialization library.  The statement below requires
 118         // that destructor of type T be public and this creates
 119         // a problem for some users.  So, for now, comment this
 120         // out
 121         //delete static_cast<T const *>(p);
 122         // and trap any attempt to invoke this function
 123         assert(false);
 124     }
 125 };
 126
 127 } // namespace serialization
 128 } // namespace boost
 129
 130 ///////////////////////////////////////////////////////////////////////////////
 131 // If no other implementation has been designated as default,
 132 // use this one.  To use this implementation as the default, specify it
 133 // before any of the other headers.
 134 #ifndef BOOST_SERIALIZATION_DEFAULT_TYPE_INFO
 135     #define BOOST_SERIALIZATION_DEFAULT_TYPE_INFO
 136     namespace boost {
 137     namespace serialization {
 138     template<class T>
 139     struct extended_type_info_impl {
 140         typedef BOOST_DEDUCED_TYPENAME
 141             boost::serialization::extended_type_info_typeid<T> type;
 142     };
 143     } // namespace serialization
 144     } // namespace boost
 145 #endif
 146
 147 #ifdef BOOST_MSVC
 148 #pragma warning(pop)
 149 #endif
 150 #include <boost/config/abi_suffix.hpp> // pops abi_suffix.hpp pragmas
 151
 152 #endif // BOOST_SERIALIZATION_EXTENDED_TYPE_INFO_TYPEID_HPP