Re: [Boost-users] [serialization] Multiply defined symbol:guid_initializer

Subject: Re: [Boost-users] [serialization] Multiply defined symbol:guid_initializer
From: Robert Ramey (ramey_at_[hidden])
Date: 2009-04-02 23:07:08

Look at the pimple demo in the examples or test directory.  Basically you're getting some things defined twiice.

Move the implementation of template< class Archive >
        void serialize( Archive& archive, unsigned int version ) to the *.cpp
and move 
BOOST_CLASS_EXPORT( rs::StaticText )

to the *.cpp file as well.  compile that/those *.cpp files and include in the library. This is touched upon in the manual in the part describing EXPORT.

Robert Ramey
  "Robert Dailey" <rcdailey_at_[hidden]> wrote in message news:496954360904021720o79c9c17cs18b1cf3f53da08c_at_mail.gmail.com...
  Hi,

  I'm currently trying to polymorphically serialize a class without using RTTI. I'm doing this currently in a file called StaticText.hpp:

  #ifndef RS_GUI_WIDGETS_STATICTEXT_HPP
  #define RS_GUI_WIDGETS_STATICTEXT_HPP

  #include <boost/scoped_ptr.hpp>
  #include <boost/serialization/access.hpp>
  #include <boost/serialization/base_object.hpp>
  #include <boost/serialization/string.hpp>
  #include <boost/serialization/extended_type_info_no_rtti.hpp>
  #include <boost/serialization/export.hpp>

  #include <rs/gui/widgets/Widget.hpp>
  #include <rs/gui/Text.hpp>

  namespace rs
  {
      class StaticText : public Widget
      {
      public:
          StaticText( std::string const& text );

          void Update();
          void Render( RenderSystem& renderer, Camera& camera );
          char const* get_key() const;

      private:
          StaticText() {}

          template< class Archive >
          void serialize( Archive& archive, unsigned int version )
          {
              archive & boost::serialization::base_object<Widget>( *this );

              std::string text;
              archive & text;
              m_text.reset( new Text( text ) );
          }

          boost::scoped_ptr<Text> m_text;

          friend class boost::serialization::access;
      };
  }

  BOOST_CLASS_TYPE_INFO(
      rs::StaticText,
      extended_type_info_no_rtti<rs::StaticText>
      )

  BOOST_CLASS_EXPORT( rs::StaticText )

  #endif // RS_GUI_WIDGETS_STATICTEXT_HPP

  When I compile this into a LIB first, and then link the lib into an EXE, the linker says this (Visual Studio 2008):
  gui.lib(StaticText.obj) : error LNK2005: "public: static struct boost::archive::detail::guid_initializer<class rs::StaticText> const & const boost::archive::detail::init_guid<class rs::StaticText>::guid_initializer" (?guid_initializer@?$init_guid_at_VStaticText@rs@@@detail_at_archive@boost@@2ABU?$guid_initializer_at_VStaticText@rs@@@234_at_B) already defined in main.obj

  If I move the 2 macro calls into the StaticText.cpp file, everything compiles/links just fine but I end up getting an exception thrown at runtime that says "unregistered void cast".

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