How to avoid {} when using aggregate initialization with empty base class

Question

C++17\'s aggregate initialization for base class is awesome, but it is verbose when the base is only there to provide some functions (so no data members).

Here is mi

Answer 1

You can still provide constructor, for example:

template  using always_t = T;

struct base_pod
{
    // functions like friend compare operator
};
template struct der_pod_impl;

template
struct der_pod_impl> : base_pod
{
    der_pod_impl(always_t... args) : k{args...} {}

    T k[sizeof...(Is)];
};

template
using der_pod = der_pod_impl>;

Demo