[groovy-dev] Declaring multiple return types (Was: Re: [groovy-dev] I'll give a Groovy presentation at the Jazoon'08)

Quoting "Martin C. Martin" <martin@...>:

>> It suffices to put the types on parameters only, the return type   
>> then should be inferable.
>> (Recursive methods are an exception, but that is another story)
>
> By the compiler, or by the user?  How would a user infer the return
> type of something like this:
>
> def getAllConnectingCities(String origin_city)
>
> ?
>
> From the name, it's probably returning a collection.  But is it a Set,
> a List, an array, or a hash table?  Or is it returning multiple values
> wrapped in an Object[], say the collection along with distance of the
> nearest and furthest cities?

Hm... there is a feature request lurking here:

     class City {
         [City, double distance] getClosestCity() { ... }
     }

to declare the types of the two return values (along with the  
information that the method returns two values and what they mean).

Regards,

--

-- 
Aaron "Optimizer" Digulla a.k.a. Philmann Dark
"It's not the universe that's limited, it's our imagination.
Follow me and I'll show you something beyond the limits."
http://www.pdark.de/

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