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 T, T... Values>
struct Valuelist {
};
template<typename T, T... Values>
struct IsEmpty<Valuelist<T, Values...>> {
static constexpr bool value = sizeof...(Values) == 0;
};
template<typename T, T Head, T... Tail>
struct FrontT<Valuelist<T, Head, Tail...>> {
using Type = CTValue<T, Head>;
static constexpr T value = Head;
};
template<typename T, T Head, T... Tail>
struct PopFrontT<Valuelist<T, Head, Tail...>> {
using Type = Valuelist<T, Tail...>;
};
template<typename T, T... Values, T New>
struct PushFrontT<Valuelist<T, Values...>, CTValue<T, New>> {
using Type = Valuelist<T, New, Values...>;
};
template<typename T, T... Values, T New>
struct PushBackT<Valuelist<T, Values...>, CTValue<T, New>> {
using Type = Valuelist<T, Values..., New>;
};