Implementing meta-function zip in c++11

Question

I am actually trying to see if I can get a minimal library that supports the very few operations I use from boost::fusion.

Here is what I have so far...

Answer 1

This is the shortest implementation I've discovered:

template  struct typelist { };   
template  struct prepend;
template  struct joincols;
template  struct zip;    

template 
struct prepend > {
  typedef typelist type;
};

template <>
struct joincols,typelist<> > {
  typedef typelist<> type;
};

template 
struct joincols,typelist<> > {
  typedef typename
    prepend<
      typelist,
      typename joincols,typelist<> >::type
    >::type type;
};

template 
struct joincols,typelist > {
  typedef typename
    prepend<
      typename prepend::type,
      typename joincols,typelist >::type
    >::type type;
};

template <>
struct zip<> {
  typedef typelist<> type;
};

template 
struct zip {
  typedef typename joincols::type>::type type;
};