variantstorageasunion.hpp

The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017


template<typename... Types>
union VariantStorage;

template<typename Head, typename... Tail>
union VariantStorage<Head, Tail...> {
  Head head;
  VariantStorage<Tail...> tail;
};

template<>
union VariantStorage<> {
};