Re: [Boost-users] [serialization, ASIO] Assertion when serializing recursive boost::variant type

From: Jeffrey Chang (jeffrey8chang_at_[hidden])
Date: 2007-09-05 14:50:12

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 <falco.hirschenberger_at_[hidden]>
wrote:
>
> Hi,
>
> I have defined a recursive variant type like this:
> ---
> typedef boost::make_recursive_variant<bool,
>                      int,
>                      double,
>                      std::string,
>                      std::vector< boost::recursive_variant_ >,
>                      std::map<std::string, boost::recursive_variant_>,
>                      TGrey8Image,
>                      TRgbImage,
>                      TRgbaImage>::type TVType;
> ---
> and two containers which can store this type:
> ---
> typedef std::vector<TVType> TVector;
> typedef std::map<std::string, TVType> 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_step<boost::mpl::l_iter<boost::mpl::l_end>,
> boost::mpl::l_iter<boost::mpl::l_end> >, Visitor =
>
> boost::detail::variant::invoke_visitor<boost::detail::variant::direct_assigner<const
> int> >, VPCV = void*, NBF =
> boost::variant<boost::detail::variant::recursive_flag<bool>, int, double,
> std::basic_string<char, std::char_traits<char>, std::allocator<char> >,
> std::vector<boost::recursive_variant_,
> std::allocator<boost::recursive_variant_> >,
> std::map<std::basic_string<char, std::char_traits<char>,
> std::allocator<char> >, boost::recursive_variant_,
> std::less<std::basic_string<char, std::char_traits<char>,
> std::allocator<char> > >, std::allocator<std::pair<const
> std::basic_string<char, std::char_traits<char>, std::allocator<char> >,
> boost::recursive_variant_> > >, CIS::Image2d<unsigned char>,
> CIS::Image2d<CIS::RGB>, CIS::Image2d<CIS::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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