Is it possible to iterate an mpl::vector at run time without instantiating the types in the vector?

Question

Generally, I would use boost::mpl::for_each<>() to traverse a boost::mpl::vector, but this requires a functor with a template function declar

Answer 1

I liked (up-voted) the solution with pointer and own defined *_for_each function. Here is an alternative using type wrapper for T if the goal is to avoid object creation till it is needed.

template
struct Wrapper
{
  typedef T type;
};

struct Functor
{
  template void operator()(T t)
  {
    T::type obj(1);
    T::type::static_fuc();
  }
};

struct T1
{
  T1(int a) : m_a(a) { }
  int m_a;
  static inline void static_fuc() { }
};
struct T2
{
  T2(int a) : m_a(a) { }
  int m_a;
  static inline void static_fuc() { }
};

void fun()
{
  namespace mpl=boost::mpl;
  typedef mpl::vector,Wrapper > t_vec;
  mpl::for_each(Functor());
}