Steven Watanabe wrote:

AMDG

Alban Linard wrote:

...

Hi,

i am trying to build a recursive variant containing another variant, as described in the following source code:

#include <cstdlib> #include <vector> #include <string> #include <boost/variant.hpp>

typedef ::boost::variant < int , bool > first_variant;

typedef ::boost::make_recursive_variant < first_variant , ::std::string , ::std::vector< ::boost::recursive_variant_ > >::type second_variant;

int main() { first_variant f(true); second_variant s(f); return EXIT_SUCCESS; }

It does not compile (g++-4.0 and g++-4.3). It seems that the "first_variant" part of second_variant is not used. Why this behavior ? Is there a workaround ?

This is a bug in boost::variant. You can fix it by changing line 101 of boost/variant/recursive_variant.hpp from typedef ::boost::variant< types > type; to typedef ::boost::variant< over_sequence<types> > type;

In Christ, Steven Watanabe

Thank you very much! Next step, i would like to store a container of first_variant instead of a single one. #include <cstdlib> #include <vector> #include <boost/variant.hpp> typedef ::boost::variant < int , bool > first_variant; typedef ::boost::make_recursive_variant < ::std::vector< first_variant > , ::std::vector< ::boost::recursive_variant_ > >::type second_variant; int main() { ::std::vector< first_variant > f; second_variant s(f); return EXIT_SUCCESS; } This crashes, too. Again, did i use it wrong or is it another problem ? Thanks, Alban Linard

Steven Watanabe a écrit :

AMDG

Alban Linard wrote:

...

Thank you very much!

Next step, i would like to store a container of first_variant instead of a single one.

#include <cstdlib> #include <vector> #include <boost/variant.hpp>

typedef ::boost::variant < int , bool > first_variant;

typedef ::boost::make_recursive_variant < ::std::vector< first_variant > , ::std::vector< ::boost::recursive_variant_ > >::type second_variant;

int main() { ::std::vector< first_variant > f; second_variant s(f); return EXIT_SUCCESS; }

This crashes, too. Again, did i use it wrong or is it another problem ?

It's a part of the same problem. The fix I gave wasn't quite right. Try applying the patch I attached to http://svn.boost.org/trac/boost/ticket/1654

In Christ, Steven Watanabe

Your patch solved the second problem too. Again, thank you very much. Alban Linard