[Haskell-cafe] File path programme

[Malcolm Wallace]

Keean Schupke <k.schupke at imperial.ac.uk> writes:

> >So let's define a new algebraic datatype something like:
>
> I think you can guess what comming - why not use a class for extensibility:
>     class Path p where ...
> The path class would provide all the operations for using paths...

Yup, good idea, and I think this would also allow David Roundy's
suggestion of a FastString implementation of filepaths - it becomes
just another instance.

> This has the advantage that people can add instances for platforms 
> without having to alter the code in the library...

Exactly.  Yes.

Regards,
    Malcolm