abstract class ICacheable
{
   virtual void cache() = 0;
}

template <bool Caching = false>
class Cacheable : public ICacheable
{
   inline void cache() {}
}

template <>
class Cacheable<true> : public ICacheable
{
   inline void cache() { /* ... */ }
}

class Scheduler
{
   inline static ICacheable new(bool isCacheable)
   {
      return (isCacheable)? new Cacheable<true> : Cacheable<false>;
   }
}