[serialization] Difficulty getting serialization to work.

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Dieter Buys

14 Jul 2006 14 Jul '06

10:58 p.m.

Hi, I am experiencing difficulties in getting the Boost serialization library to work. There seems to be an error related to object tracking, as I am getting BOOST_STATIC_ASSERTION_FAILURE<x>. I am trying to figure it out using the attached test code. The documentation claims I should be putting a BOOST_SERIALIZATION_TRACKING() macro in my file (presumably directly after my class definition). I did a full text search over the entire source of the library and nowhere did this preprocessor macro exist. There is a BOOST_CLASS_TRACKING() macro, which I tried putting in my source with tracking_never. That seems to have made no appreciable difference. I have absolutely no idea what I am supposed to do. :( Any help would be appreciated. Thanks, ~ Dieter Buys #include <fstream> #include #include #include #include #include class gps_position { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; public: gps_position() {}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; // BOOST_CLASS_TRACKING(gps_position, track_never) int main(void) { std::ofstream ofs("serial.txt"); gps_position *g = new gps_position(35, 59, 24.567f); // const gps_position g(35, 59, 24.567f); { boost::archive::text_oarchive oa(ofs); oa << g; } delete g; gps_position *newg; // gps_position newg; { std::ifstream ifs("serial.txt", std::ios::binary); boost::archive::text_iarchive ia(ifs); ia >> newg; } delete newg; return 0; }

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Robert Ramey

15 Jul 15 Jul

4:14 a.m.

New subject: [serialization] Difficulty getting serialization towork.

The change I've suggested below should do it. This is explained in the "rationale" section of the manual. Robert Ramey Dieter Buys wrote:

...

...
Hi,

I am experiencing difficulties in getting the Boost serialization library to work. There seems to be an error related to object tracking, as I am getting BOOST_STATIC_ASSERTION_FAILURE<x>. I am trying to figure it out using the attached test code. The documentation claims I should be putting a BOOST_SERIALIZATION_TRACKING() macro in my file (presumably directly after my class definition). I did a full text search over the entire source of the library and nowhere did this preprocessor macro exist. There is a BOOST_CLASS_TRACKING() macro, which I tried putting in my source with tracking_never. That seems to have made no appreciable difference.

I have absolutely no idea what I am supposed to do. :( Any help would be appreciated.

Thanks, ~ Dieter Buys

...
#include <fstream>

#include

#include #include #include #include

class gps_position { private: friend class boost::serialization::access;

template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; }

int degrees; int minutes; float seconds;

public: gps_position() {}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; // BOOST_CLASS_TRACKING(gps_position, track_never)

int main(void) { std::ofstream ofs("serial.txt");

gps_position *g = new gps_position(35, 59, 24.567f); // const gps_position g(35, 59, 24.567f);

const gps_position * const g = new gps_position(35, 59, 24.567f);

...

...
{ boost::archive::text_oarchive oa(ofs); oa << g; } delete g;

gps_position *newg; // gps_position newg; { std::ifstream ifs("serial.txt", std::ios::binary); boost::archive::text_iarchive ia(ifs); ia >> newg; } delete newg;

return 0; }

...
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Dieter Buys

17 Jul 17 Jul

4:50 p.m.

New subject: [serialization] Difficulty getting serialization towork.

Thanks Robert, This is the error I get when I change that line to exactly what you suggested: ------ Build started: Project: Test, Configuration: Debug Win32 ------ Compiling... test_serial.cpp c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\oserializer.hpp(435) : error C2027: use of undefined type 'boost::serialization::extended_type_info_null<T>' with [ T=gps_position ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\oserializer.hpp(467) : see reference to function template instantiation 'void boost::archive::detail::save_pointer_type::save(Archive &,const T &,const boost::archive::detail::basic_pointer_oserializer *)' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=const gps_position *, T=gps_position ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\oserializer.hpp(447) : while compiling class template member function 'void boost::archive::detail::save_pointer_type::invoke(Archive &,const gps_position)' with [ Archive=boost::archive::text_oarchive, TPtr=const gps_position * ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\oserializer.hpp(536) : see reference to class template instantiation 'boost::archive::detail::save_pointer_type' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=const gps_position * ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\basic_text_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::save(Archive &,const T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=const gps_position *const ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\interface_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::basic_text_oarchive<Archive>::save_override<T>(T &,int)' being compiled with [ Archive=boost::archive::text_oarchive, T=const gps_position *const ] c:\documents and settings\dieter buys\my documents\temp\testserial\test_serial.cpp(43) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator <<(T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=const gps_position *const ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\oserializer.hpp(438) : error C3203: 'is_polymorphic' : unspecialized class template can't be used as a template argument for template parameter 'C', expected a real type c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\if.hpp(63) : error C2825: 'T1': must be a class or namespace when followed by '::' c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\eval_if.hpp(40) : see reference to class template instantiation 'boost::mpl::if_' being compiled with [ T1=int, T2=boost::mpl::identity::polymorphic>, T3=boost::mpl::identity::non_polymorphic> ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\archive\detail\oserializer.hpp(438) : see reference to class template instantiation 'boost::mpl::eval_if' being compiled with [ C=int, F1=boost::mpl::identity::polymorphic>, F2=boost::mpl::identity::non_polymorphic> ] c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\if.hpp(63) : error C2039: 'value' : is not a member of '`global namespace'' c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\if.hpp(63) : error C2226: syntax error : unexpected type 'T1' c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\if.hpp(63) : error C2144: syntax error : 'T1' should be preceded by '(' c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\if.hpp(70) : error C2955: 'boost::mpl::if_c' : use of class template requires template argument list c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\if.hpp(37) : see declaration of 'boost::mpl::if_c' c:\documents and settings\dieter buys\my documents\libraries\boost_1_33_1\boost\mpl\eval_if.hpp(41) : fatal error C1903: unable to recover from previous error(s); stopping compilation Build log was saved at "file://c:\Documents and Settings\Dieter Buys\My Documents\Temp\TestSerial\Debug\BuildLog.htm" Test - 8 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== Dieter Buys Robert Ramey wrote:

...

The change I've suggested below should do it. This is explained in the "rationale" section of the manual.

Robert Ramey

Dieter Buys wrote:

...
...
Hi,

I am experiencing difficulties in getting the Boost serialization library to work. There seems to be an error related to object tracking, as I am getting BOOST_STATIC_ASSERTION_FAILURE<x>. I am trying to figure it out using the attached test code. The documentation claims I should be putting a BOOST_SERIALIZATION_TRACKING() macro in my file (presumably directly after my class definition). I did a full text search over the entire source of the library and nowhere did this preprocessor macro exist. There is a BOOST_CLASS_TRACKING() macro, which I tried putting in my source with tracking_never. That seems to have made no appreciable difference.

I have absolutely no idea what I am supposed to do. :( Any help would be appreciated.

Thanks, ~ Dieter Buys

...
#include <fstream>

#include

#include #include #include #include

class gps_position { private: friend class boost::serialization::access;

template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; }

int degrees; int minutes; float seconds;

public: gps_position() {}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; // BOOST_CLASS_TRACKING(gps_position, track_never)

int main(void) { std::ofstream ofs("serial.txt");

gps_position *g = new gps_position(35, 59, 24.567f); // const gps_position g(35, 59, 24.567f);

const gps_position * const g = new gps_position(35, 59, 24.567f);

...
...
{ boost::archive::text_oarchive oa(ofs); oa << g; } delete g;

gps_position *newg; // gps_position newg; { std::ifstream ifs("serial.txt", std::ios::binary); boost::archive::text_iarchive ia(ifs); ia >> newg; } delete newg;

return 0; }

...
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Robert Ramey

5:57 p.m.

New subject: [serialization] Difficulty getting serializationtowork.

I just compiled, linked and ran your example on my VC 7.1 one system and it worked just fine. Robert Ramey

Dieter Buys

6:58 p.m.

New subject: [serialization] Difficulty getting serialization to work.

Robert Ramey wrote:

...

I just compiled, linked and ran your example on my VC 7.1 one system and it worked just fine.

Robert Ramey

Hi Robert, I found a forum thread on GameDev.net (http://www.gamedev.net/community/forums/topic.asp?topic_id=380003) which advised me to rearrange the header files so that the archives are included before the serialization ones, thus: #include #include #include #include #include #include This solved the problem. Thanks for your help, ~ Dieter Buys

Robert Ramey

8:57 p.m.

New subject: [serialization] Difficulty getting serializationto work.

Ahh - the explains it - I was building with 1.34 to be released "real soon now" Robert Ramey Dieter Buys wrote:

...

Robert Ramey wrote:

...
I just compiled, linked and ran your example on my VC 7.1 one system and it worked just fine.

Robert Ramey

Hi Robert,

I found a forum thread on GameDev.net (http://www.gamedev.net/community/forums/topic.asp?topic_id=380003) which advised me to rearrange the header files so that the archives are included before the serialization ones, thus:

#include #include #include

#include #include #include

This solved the problem.

Thanks for your help, ~ Dieter Buys

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