Re: [Boost-users] variant visitor using SFINAE problem

...

What visit() overload did you intend to call for vector<int>? Note that enable_if condition: mpl::and_< boost::has_range_const_iterator<VisitableT>, boost::is_void<typename VisitorT::result_type> >,

seems to be fulfilled for vector<int> case, doesn't it? But it's obviously not the right overload, as int is not variant.

thank you, you did point out it; unfortunately, my extension doesn't compile.

Because you actually should apply is_variant metafunction to the value_type of the container, not to the container itself: mpl::not_, <....> is_variant<typename VisitableT::value_type>, HTH, Igor'.