[boost] [MPL] vector of vectors

[David A. Greene]

Is it possible to have an MPL vector of MPL vectors? When I
try this, the compiler (g++ 3.2) complains about an incomplete
type for push_back_traits:

#include <boost/mpl/vector.hpp>
#include <boost/mpl/integral_c.hpp>
#include <boost/mpl/push_back.hpp>

int main(void)
{
typedef boost::mpl::vector<> vec;

typedef boost::mpl::push_back<
vec,
boost::mpl::vector<char, boost::mpl::integral_c<int, 1> >
>::type vec2;

return(0);
}

vector_test.cc: In instantiation of `boost::mpl::push_back<main()::vec, boost::mpl::vector<char, boost::mpl::integral_c<int, 1>, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_> >':
vector_test.cc:12: instantiated from here
vector_test.cc:12: base class `
boost::mpl::push_back_traits<boost::mpl::aux::vector_tag<0>
>::algorithm<main()::vec, boost::mpl::vector<char,
boost::mpl::integral_c<int, 1>, boost::mpl::void_, boost::mpl::void_,
boost::mpl::void_, boost::mpl::void_, boost::mpl::void_, boost::mpl::void_,
boost::mpl::void_, boost::mpl::void_> >' has incomplete type

This seems like a useful thing to do. Is it really not supported?

-Dave

--
"Some little people have music in them, but Fats, he was all music,
and you know how big he was." -- James P. Johnson

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