Multiple Variadic Parameter Pack for Template Class

Question

I am using variadic parameter packs for policy based class design.

template 
class IShader : public Policies... {

};
         


        

Answer 1

In the discussion comments you expressed a willingness to consider some kind of indirection, or "a wrapper of some kind for the attribute list".

A lightweight std::tuple-based wrapper, together with specialization, might work here:

template  class IShader;

template 
class IShader, APIType,
              std::tuple> : public Policies... {

// ...

};

The goal here is to use a template instance along the lines of:

IShared, APITypeFoo,
        std::tuple> ishared_instance;

And cross your fingers that this is going to match the specialized template declaration, at which point both parameter packs are available for the template specialization to use, individually.