[PEAK] generic function signature changes

[Simon Belak]

I don't think so:

     from dispatch import generic

     @generic()
     def foo(bar):
         pass

     @foo.when("bar > 2")
     def foo_gt_2(bar):
         return "bar > 2"

     @foo.when("bar == 2")
     def foo_gt_2(bar, baz=24):
         return baz

     print foo(4)
     print foo(2)

Arguments just need to be optional or keyword.

Cheers,
Simon


Kevin Dangoor wrote:
> Am I correct that it is harder to change a generic function's
> signature than it is to change an ordinary function's signature? Let's
> say you have this function:
> 
> def foo(bar)
> 
> As an ordinary Python function, you can do this:
> 
> def foo(bar, baz=None)
> 
> without breaking any subclasses (if this were a method) or anyone else
> using the function. But, if you add an additional, even optional,
> parameter to a generic function, all of the implementers of that
> function need to change as well...
> 
> Is that right?
> 
> Kevin
>