How to declare function with the same call signature as another?

[ketmar via Digitalmars-d-learn]

On Wednesday, 23 November 2016 at 22:14:25 UTC, Tofu Ninja wrote:
> What is a (ref int)? A tuple with "ref int" as its only member? 
> Since when is ref int a type?

it is "type with modifier", like "const int" or "immutable int".