C++ template programming struct vs template

Question

To provide a functionality for a class cls, say, 'add', following are the types I decided:

struct add
{
      add sum(add other) { ... }
};

vs.

template<typename Add>
Add sum(Add one, Add two) { ... }

Which approach should be preferred, what advantages do the first have over the second and vice versa?

Answer 1

Which approach should be preferred, what advantages do the first have over the second and vice versa?

I believe the question does not have a straightforward answer. I think this goes down to the Generic Vs Object Oriented Programming battle.

See also On the Tension Between Object-Oriented and Generic Programming in C++.