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template <typename ...Types>
struct Remove;
template<typename Rm>
struct Remove<TypeList<Rm>> // empty list
{
using Removed = TypeList<>;
};
template<typename Rm, typename ...Tail> // remove Rm fm the head,
struct Remove<TypeList<Rm, Rm, Tail...>>
{
using Removed = typename Remove<TypeList<Rm, Tail...>>::Removed;
};
// keep First, rm Rm from Tail
// concatenate the two
template<typename Rm, typename First, typename ...Tail>
struct Remove<TypeList<Rm, First, Tail...>>
{
using Removed = TypeList<First,
typename Remove<TypeList<Rm, Tail...>>::Removed>;
};
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