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

Just encountered the same situation and provided different solution to the problem which I would like to share. It's not as that obvious, but it uses an existing algorithm. The idea is to use pointers instead.

typedef boost::mpl::vector container;

struct functor
{
    template void operator()(T*)
    {
        std::cout << "created " << typeid(T).name() << std::endl;
    }
};

int main()
{
    boost::mpl::for_each(functor());
}

so here we get a null pointers, but we don't care as we are not going to use them.

As I stated before that is not obvious in the code and would probably require some additional comments, but it still solves the question without writing any additional code.

added

I think Diego Sevilla suggested something similar.