#include <tr1/tuple>
#include <vector>

struct tuple_tree
: std::tr1::tuple
  < float
#if 1
  , std::vector<tuple_tree>
#else
  , tuple_tree
#endif
  >
{
};
  
int main(void)
{
    tuple_tree tt;
  #if 1
    std::vector<tuple_tree>&children=std::tr1::get<1>(tt);
    children.push_back(tuple_tree());
  #endif
    return std::tr1::get<0>(std::tr1::get<1>(tt)[0]);
}