C++ index of type during variadic template expansion

Question

I have a simple yet daunting problem I can\'t solve by myself. I have something like

template
T* create(SomeCastableType* args,         


        

Answer 1

You need a helper:

#include 

template 
struct helper
{
    static T * go(S * args)
    {
        return helper::value,
                      Tuple, I..., sizeof...(I)>::go(args);
    }
};

template 
struct helper, I...>
{
    static T * go(S * args)
    {
        return new T(static_cast(args[I])...);
    }
};

template 
T * create(S * args)
{
    return helper>::go(args);
}

Edit: Tested, seems to work.