indexlistreverse.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... Elements, unsigned... Indices>
auto reverseImpl(Tuple<Elements...> const& t, 
                 Valuelist<unsigned, Indices...>)
{
  return makeTuple(get<Indices>(t)...);
}

template<typename... Elements>
auto reverse(Tuple<Elements...> const& t) 
{
  return reverseImpl(t, 
                     Reverse<MakeIndexList<sizeof...(Elements)>>());
}