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From: Steven Simpson <ss@domain.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: generics puzzle
Date: Mon, 17 Oct 2011 16:26:59 +0100
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On 17/10/11 15:33, markspace wrote:
> On 10/17/2011 5:14 AM, Steven Simpson wrote:
>> On 17/10/11 11:41, blmblm@myrealbox.com wrote:
>>> One fix is to just introduce a method setFromModified() in GThing,
>>> but that doesn't appeal to me.
>>
>> Instead of adding it to GThing, create a static method:
>>
>> private static<T> void setModified(GThing<T> t) {
>> t.set(t.modified());
>> }
>
>
> I don't like the T here.  While it compiles, this T is a different T 
> than the other T.

Ah, T time! ;-)

> public class GThing<T> {
>
>   private static <U> void setModified( GThing<U> t ) {
>
>  ...other T's stay the same.
> }

I meant that the static method didn't belong in GThing at all.  The 
author of the call site factors it out of his code, and keeps it near 
the call site, in order to deal with an issue that arises very 
specifically out of the design of that site.  Ideally, it would be an 
Ada-like local method, but he has to settle for a near-by static.  The 
author of GThing is unaware of it, and is not responsible for it.

-- 
ss at comp dot lancs dot ac dot uk