Class Storage

test/te.cpp:558–571

class Dtor;

struct Storage {
  template <class T>
  static auto &calls() {
    static auto calls = 0;
    return calls;
  }

  Storage() { ++calls<Ctor>(); }
  Storage(const Storage &) { ++calls<CopyCtor>(); }
  Storage(Storage &&) { ++calls<MoveCtor>(); }
  ~Storage() { ++calls<Dtor>(); }

  double someDummyDataSoTypeIsNonEmpty = 0;
};

test should_support_ref_storage = [] {
  Storage::calls<Ctor>() = 0;