Re: Multiple dispatch problem with swap()

I have a base class that provides a swap() method.
In a derived class I have some caching. Swapping the Base slice makes
sense, but it invalidates the cache. No problem if *this is the derived
class, I could simply override swap. But what if the derived class is
the argument to swap?

class Base
{
   virtual void swap(Base& right);
};

class Derived
{
   int SomeCache;
   virtual void swap(Base& right);
}

Base b();
Derived d();
b.swap(d);

Then Base::swap is called, which obviously knows nothing about Derived.

Is there a way to come around that?