Override template function with polymorphic one

[Elliot Woods]

Hi there!

If I have

template<class T>
TalkyBuffer& operator<<(T const &object) { // Template
...
}
TalkyBuffer& operator<<(TalkySerialisable const &object); // Override 

and a class

class A : public TalkySerialisable {
...}

Then if I perform

TalkyBuffer b;
A test;
b << test;

Then gcc is calling the Template function rather than the Override function

However if I specifically define an override

TalkyBuffer& operator<<(A const &object); // Override without polymorphism 

Then gcc picks that one.
Is there a practical way to override a templated function with an abstract class?

I read this but it doesn't shed light onto what happens when you throw polymorphism into the mix:
http://www.gotw.ca/publications/mill17.htm

Thanks for reading!
elliot