#include <iostream>
#include <cassert>
 
template<typename T, size_t N=128>
struct A {
  size_t count;
  T data[N];
};
 
template <typename T, size_t N=128>
struct B {
  int a;
  A<T, N> b;
};
 
template <typename T, typename...U>
B<T, sizeof...(U)+1> make_b(int a, const T& t, const U&...u)
{
  constexpr auto size = sizeof...(U) + 1;
  return {a, {size, {t, u...}}};
}
 
int main() {
 
  const auto test = make_b(42, 1, 2, 3, 4, 5);
 
  assert(test.a == 42);
  assert(test.b.count == 5);
  assert(test.b.data[0] == 1);
  assert(test.b.data[4] == 5);
}
 

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