Template template parameters with variadic templates

Question

For the sake of clarity, I\'ve removed things like the constructor & destructor etc from the below where they don\'t add anything to the question. I have a base class t

Answer 1

You've got your ellipsis in the wrong place. Try:

template class... Args>
                                    ^^^ here

However, you don't actually want template template parameters; since DerivedSystem1<1> is a type, not a template, you just want ordinary typename parameters:

template
class ContainerClass {

For the actual container, you can't use vector as that is homogeneous and will slice the derived types down to PeripheralSystem. If you add a virtual destructor to PeripheralSystem you can use vector>:

template
class ContainerClass {
  public:
    ContainerClass() : container{std::make_unique()...} {}
    std::vector> container;
};

However, tuple would work just as well and result in fewer allocations:

template
class ContainerClass {
  public:
    ContainerClass() : container{Args{}...} {}
    std::tuple container;
};