From: David Abrahams

Is it possible to do this trick during compilation time? I was able to go from type lists to boost::cons but I can't find a way to make that last step.

Not sure what you mean by "that last step..." namespace mpl = boost::mpl; using namespace mpl::placeholders; typedef mpl::vector types; typedef mpl::fold >::type tuple_type; tuple_type some_tuple; When I try to compile this, I receive the following error: boost/mpl/aux_/preprocessed/plain/apply_wrap.hpp(48) : error C2039: 'apply' : is not a member of 'boost::mpl::na' What does this means? Thx ImRe