Hi, Falco: Have you made any progress in this issue? I've encountered halt at the same point: /usr/include/boost/variant/detail/visitation_impl.hpp:203 while deleting a boost Asio Timer object. I'm using Boost v1.33.1 and Asio v0.3.6, and I'm not aware that Asio has "serialization" feature (is it new in Asio v0.3.7+?). And this halt does NOT happen on the my code unless I compiled it with "-O2"; so, too bad, I don't have a readable gdb backtrace. But from the log info in my code, it happens close to the point in some of my class destructor that contains Asio Timer object. I don't use boost "variant" class in my code, and I guess it must be asio that uses it, and i have no clue how it leads to halt at line 203. HTH & Let me know if you have any info on why it happens, --- Jeffrey On 3/23/07, Falco Hirschenberger wrote:

Hi,

I have defined a recursive variant type like this: --- typedef boost::make_recursive_variant, std::map, TGrey8Image, TRgbImage, TRgbaImage>::type TVType; --- and two containers which can store this type: --- typedef std::vector<TVType> TVector; typedef std::map TMap; --- I wrote a set of unit-tests testing all types of plain and recursive containers and they work as expected. I also tested (de-)serialization to a binary archive and there's also no problem. Then I implemented a Message class which contains such a TVType + some other stuff. Serializing and deserializing also works in the tests. Finally I implemented a client and server with ASIO like the ASIO "serialization" example. First sending the size of the archive and then the data itself. The sending works but when I want to deserialize my message I get the following assertion: --- testSerialization: /usr/include/boost/variant/detail/visitation_impl.hpp:203: typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&, VPCV, mpl_::true_, NBF, W*, S*) [with W = mpl_::int_<20>, S =

boost::detail::variant::visitation_impl_stepboost::mpl::l_end, boost::mpl::l_iterboost::mpl::l_end >, Visitor =

boost::detail::variant::invoke_visitor, VPCV = void*, NBF = boost::variant, std::vectorboost::recursive_variant_ >, std::map, boost::recursive_variant_, std::less >, std::allocator, boost::recursive_variant_> > >, CIS::Image2d<unsigned char>, CIS::Image2dCIS::RGB, CIS::Image2dCIS::RGBA, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_]: Assertion `false' failed. --- I absolutely don't know what't wrong here the backtrace iss huge but the point in my code where it happens is the line when deserializing the message. When I comment out the TVType payload of the message, it works.

I would really appreciate any clue.

Greetings, Falco

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