Template of the base variant of the Variable template: no parameters or one?

Question

I would like to know which of these (if any) options would be preferable.

For example, I implement the sum function, taking an arbitrary number of arguments. Main template then

template <typename T, typename... Ts>
auto sum(T t, Ts... ts)
{
    return t + sum(ts...);
}

In the base case, I see at least two options:

• Base Register - Amount ():

  auto sum() 
  { 
      return 0; 
  }
  

• The base case is equal to the sum (T):

  template <typename T>
  auto sum(T t)
  {
      return t;
  }
  

Both of these seem to work the same way in this case, but which one is usually preferable?

Answer 1

The second case is more general than option 1, which introduces int.

.. sum , . ( , ).

int,

auto res = sum('*');

int 1 char 2