Thank you, George and Krzysztof. The reason I asked about this is that I’m getting an error when trying to implement serialize into my class, and I thought this was due to the serialize template only being in one of the serialization libraries, thinking they all had different functions. The error I get is: C:/boost_1_54_0/boost/serialization/access.hpp:118: undefined reference to `void boinc::work::Sudoku::serialize<boost::archive::binary_oarchive>(boost::archive::binary_oarchive&, unsigned int)' Googling the error, I found this link: http://stackoverflow.com/questions/9795888/boost-serialization-using-separat... Which mentions putting the definition into the header, which I’ve tried, but I still get the same error. So given the following code, can anyone tell me what I’m doing wrong? #ifndef SUDOKU_HPP_ #define SUDOKU_HPP_ #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> namespace boinc { class Sudoku { friend class boost::serialization::access; private: template<class Archive> void serialize(Archive &ar, const unsigned int version) { ... } }; } } #endif I have been following the serialization tutorial here: http://www.boost.org/doc/libs/1_54_0/libs/serialization/doc/tutorial.html And I don’t see any difference between my code and the code in the documentation, besides the archive inclusions. From: Krzysztof Czainski Sent: Wednesday, October 09, 2013 3:43 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] How to choose which library version to choose? 2013/10/9 Michael Kragh Pedersen <m_kragh_pedersen@hotmail.com> I have downloaded and built the Boost library, as according to these instructions: http://theseekersquill.wordpress.com/2010/08/24/howto-boost-mingw/ I need to use the serialization library, so I looked at the stage\lib folder, only to 16 different library files! Some are named mt, some sd, some s or d, and some a combination thereof, all this following libboost_serialization-mgw48. Some are dll files and some are a files. Those are different variants of the same library; you should choose one variant, and link to that variant only. -mt means multithreading -s means static (I think) -d means debug -sd probably means static debug I tried using –lboost_serialization, as I have seen this mentioned on a lot of forums, but Eclipse says it can’t find that library. So how on Earth am I supposed to figure out which of the many files to link to?! If you want the static single-threading non-debug version, you probably need something like -lboost_serialization-s-mgw48 -LX:\path\to\boost\libs HTH, Kris -------------------------------------------------------------------------------- _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users