Re: [Boost-users] [serialization] std::shared_ptr with Boost >= 1.53

Dear Robert, see below for a simple test program that illustrates what I'm trying to do. This compiles with Boost 1.58, but fails on 1.53 with the error message /opt/boost153/include/boost/serialization/access.hpp:118:11: error: no member named 'serialize' in 'std::__1::shared_ptr<test>' t.serialize(ar, file_version); I need to support Boost versions starting with 1.53. Thus I have two options: - do serialization of std::shared_ptr myself - include the 1.58 boost/serialization/shared_ptr.hpp for older Boost-versions. What is the best way ? Thanks and Best Regards, Beet /*******************************************************/ // Compile with // g++ --std=c++11 -o sharedptr sharedptr.cpp -I /opt/boost158/include/ // -L/opt/boost158/lib -lboost_serialization -lboost_system // on MacOS, Linux #include <iostream> #include <memory> #include <sstream> #include #include #include #include #include class test { /////////////////////////////////////////////////////////////////////// friend class boost::serialization::access; template<typename Archive> void serialize(Archive & ar, const unsigned int) { using boost::serialization::make_nvp; ar & BOOST_SERIALIZATION_NVP(secret_); } /////////////////////////////////////////////////////////////////////// public: test(): secret_(1) {} private: int secret_; }; int main() { std::vector t_vec, t_vec2; std::ostringstream oss; t_vec.push_back(std::shared_ptr<test>(new test())); // save data to archive { boost::archive::xml_oarchive oa(oss); // write class instance to archive oa & BOOST_SERIALIZATION_NVP(t_vec); // archive and stream closed when destructors are called // Data is now in oss } // load data from archive { std::istringstream iss(oss.str()); boost::archive::xml_iarchive ia(iss); // read class state from archive ia & BOOST_SERIALIZATION_NVP(t_vec2); // archive and stream closed when destructors are called } return 0; } /*******************************************************/ Am 04.05.15 um 01:34 schrieb Robert Ramey:

beet-2 wrote

...

Dear Robert,

thanks a lot! Do I understand it correctly, that I could easily create my own serializer for std::shared_ptr by just (de)serializing the contained "raw" pointer and wrapping it into a std::shared_ptr in the case of de-serialization ?

No. You have to keep track of other shared pointers point

I had assumed from the question that the situation was something like:

// version 1 myclass { boost::shared_ptr m_p ... } // version 2 myclass { std::shared_ptr m_p ... };

and the question was asking how the latest version code would de-serialize older version (version 1) archives (data files)

Robert Ramey

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