Jorge Ortiz, Christos Loverdos and myself have a slumbering Scala
Improvement Proposal to include what you call "extension methods" to Scala
code.
We've experimented with different syntax and it depends on how you want it
to work.
I was pulling toward a more "type selector" based mechanism like the
following:
def [T <: String].isDigitsOnly() = this.matches("^\\d$")
where the prefixing type declaration selects which types are allowed to be
attached to
basically it's syntactic sugar over:
def isDigitsOnly[T <: String]( t : T) = t.matches("^\\d$")
so it's basically possible to call it using:
isDigitsOnly("blah")
and as
"blah".isDigitsOnly()
Well well, I'm crazy-talking again.
Cheers,
Viktor
On Tue, Feb 24, 2009 at 4:39 AM, Mark Derricutt <[email protected]> wrote:
> How about stealing/reusing the C# idiom of a "this" parameter:
>
> public class MyList {
> public static void sort(this List<T>, Comparator<T> comparator) {
> ..
> }
> }
>
> Which compiles to the same as you suggest, being
>
> new List().sort(comparator) being
>
> MyList.sort(new List(), comparator);
>
> This could also play well with introducing "this" as a return type for
> chaining.
>
> ...and then Buffy staked Edward. The End.
>
>
> On Tue, Feb 24, 2009 at 4:33 PM, Reinier Zwitserloot
> <[email protected]>wrote:
>
>> @Extension public static <T> void sort(List<T> list, Comparator<T>
>> comparator) { /* code */ }
>>
>
>
> >
>
--
Viktor Klang
Senior Systems Analyst
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