Hi all.  I’m playing with the boost::serialization library, but having a compile issue, with a very obscure error message.  It is as follows:

Compiler: VC7.1 on Windows XP

I get the following compile errors:

Compiling...

TestClass.cpp

c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(142) : error C2027: use of undefined type 'boost::serialization::extended_type_info_null<T>'

        with

        [

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(142) : see reference to class template instantiation 'boost::serialization::extended_type_info_null<T>' being compiled

        with

        [

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(138) : while compiling class-template member function 'bool boost::archive::detail::iserializer<Archive,T>::is_polymorphic(void) const'

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(375) : see reference to class template instantiation 'boost::archive::detail::iserializer<Archive,T>' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(369) : while compiling class-template member function 'void boost::archive::detail::load_non_pointer_type<Archive,T>::load_standard::invoke(Archive &,T &)'

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(425) : see reference to class template instantiation 'boost::archive::detail::load_non_pointer_type<Archive,T>::load_standard' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(418) : while compiling class-template member function 'void boost::archive::detail::load_non_pointer_type<Archive,T>::invoke(Archive &,T &)'

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(572) : see refe

rence to class template instantiation 'boost::archive::detail::load_non_pointer_type<Archive,T>' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\basic_text_iarchive.hpp(64) : see reference to function template instantiation 'void boost::archive::load<Archive,T>(Archive &,T &)' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\text_wiarchive.hpp(68) : see reference to function template instantiation 'void boost::archive::basic_text_iarchive<Archive>::load_override<T>(T &,int)' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\interface_iarchive.hpp(76) : see reference to function template instantiation 'void boost::archive::text_wiarchive_impl<Archive>::load_override<T>(T &,int)' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

        c:\Work\Sandbox\CppThroughCOM\CppThroughCOM\TestClass.cpp(67) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_iarchive<Archive>::operator >><CppTestClass>(T &)' being compiled

        with

        [

            Archive=boost::archive::text_wiarchive,

            T=CppTestClass

        ]

c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(142) : error C2146: syntax error : missing ';' before identifier 'typex'

c:\Dev.Releasev7.2.CR4556\3rdparty\boost\boost\archive\detail\iserializer.hpp(142) : error C2065: 'typex' : undeclared identifier

Here’s my code:

CppTestClass.hpp:

#pragma once

#include <boost/serialization/serialization.hpp>

#include <boost/serialization/base_object.hpp>

#include <boost/serialization/version.hpp>

class CppTestClass

{

private:

int m_x;

public:

CppTestClass(void);

virtual ~CppTestClass(void);

private:

friend class boost::serialization::access;

template<class Archive>

void load(Archive & ar, const unsigned int version)

      {

ar & version;

ar & m_x;

      }

template<class Archive>

void save(Archive & ar, const unsigned int version) const

      {

ar & version;

ar & m_x;

      }

public:

friend std::wostream& operator<<(std::wostream& p_stream, const CppTestClass& p_testClass)

      {

p_stream << p_testClass.m_x;

return p_stream;

      }

friend std::wistream& operator>>(std::wistream& p_stream, CppTestClass& p_testClass)

      {

p_stream >> p_testClass.m_x;

return p_stream;

      }

BOOST_SERIALIZATION_SPLIT_MEMBER()

public:

void setX(int p_x)

      {

m_x = p_x;

      }

int getX() const

      {

return m_x;

      }

};

BOOST_CLASS_VERSION(CppTestClass, 1)

In TestClass.cpp:

This gives no compile errors:

std::wstringstream ofs;

boost::archive::text_woarchive oa(ofs);

// write class instance to archive

ofs << m_cppTestClass;

      ofs >> serData;

However, this does:

// create and open an archive for input

std::wstringstream ifs;

ifs << serData;

boost::archive::text_wiarchive ia(ifs);

// read class state from archive

ia >> m_cppTestClass; //!!! errant line?

Any ideas what’s going on?

Thanks in advance,

Lawrence