Anyone ever considered named tuples?

[Marek Kozieł]

2009/3/22 Paulo Levi <i30817 at gmail.com>:
> Out of the blue, a few days ago, i wondered if a tuple construct that had
> names,
> ie: (String directory, String file) for instance, would make any sense?
> I know that spaghetti code should be factored to map to simple functions
> with simple return arguments, but i saw sooooo much code that had simple
> container semantics.
> A tuple object written as a compiler code transformation like autoboxing
> would make
> a lot of sense if it allowed names to be defined at use site.
> I'm sure you know that this can be simulated by some creative use of
> generics and static import,
> but the names (one ... first) are pretty bad.
>
> Just throwing a idea, don't bite my head off.
>
>

You need tuples or multiple return values?

I do not see any good reason to introduce tuples.

While no multiple return values is lack in language in my opinion. See
simple method:

   (boolean isSucceed, T replaced) replace(T element){
      int i = index(element);
      if (i<0) return(false,null);
      T old = elements[i];
      elements[i] = element;
      return (true,old);
   }
use:
   void sample_1(...){
      boolean efect = container.replace(element).isSucceed;
      ...
   }
   void sample_2(...){
      Boo old = container.replace(element).replaced;
      ...
   }
   void sample_3(...){
      (boolean efect = .isSucceed,Boo old = .replaced) =
container.replace(element);
      ...
   }
   void sample_4(...){
      final replaced = container.replace(element);
      boolean efect = replaced.isSucceed;
      Boo old = replaced.replaced;
      // forget replaced;
      ...
   }



Did you ever tried to do it now time?
   synchronize(container){
      T old =  container.get(element);
      if (old!=null){ // problem if element is null
         container.replace(element);
      }
   }

But there is no point to introduce that if we will have to index results.

I also disagree that maps should be used to obtain that target, while
this can be done in 100% in 'static' way.

-- 
Pozdrowionka. / Regards.
Lasu aka Marek Kozieł

http://lasu2string.blogspot.com/