From: fjh@cs.mu.oz.au (Fergus Henderson)
Subject: Re: Ultimate Language feature list
Date: 1998/05/15
Date: 1998-05-15T00:00:00+00:00 [thread overview]
Message-ID: <6jgivo$p18$1@mulga.cs.mu.OZ.AU> (raw)
In-Reply-To: 6jcjqq$jl4$1@nnrp1.dejanews.com
In comp.lang.ada and comp.lang.eiffel,
adam@irvine.com writes:
>Well, as long as we're talking about what language features we want,
>here's one I've always wanted: The ability to deal with sequences of
>objects. I don't mean a list of objects where you have to create an
>array or linked list in memory that contains all the objects; I mean
>the ability to write code that talks about sequences of objects even
>though the program only generates one at a time. So I'd like to be
>able to write a function like this:
>
> -- Integer_List is a "traditional" linked list of integers
> function Nonzero_Elements_Of (List : Integer_List)
> return sequence of Integer is
> begin
> List_P := List;
> while List_P /= null loop
> if List_P.Data /= 0 then
> return List_P.Data;
> -- Note: this RETURN would return one integer but
> -- would NOT terminate the function; eventually the
> -- caller would return to this point in the function
> -- to get more
> end if;
> List_P := List_P.Next;
> end loop;
> end;
I think you just reinvented Sather's `iterator' language construct.
Of course, some of the syntactic details are different, e.g. if I recall
correctly, this sort of iterator `return' is spelt `yield' in Sather.
But the basic concept is pretty much the same.
>Well, I can dream.
You can do better than dream -- the Sather compiler is freely available,
so you can download it and try it out! ;-)
--
Fergus Henderson <fjh@cs.mu.oz.au> | "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh> | of excellence is a lethal habit"
PGP: finger fjh@128.250.37.3 | -- the last words of T. S. Garp.
next prev parent reply other threads:[~1998-05-15 0:00 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-05-13 0:00 Ultimate Language feature list adam
1998-05-14 0:00 ` Rainer Joswig
1998-05-14 0:00 ` John English
1998-05-14 0:00 ` Michael F Brenner
1998-05-14 0:00 ` John McCabe
1998-05-14 0:00 ` Charles Hixson
1998-05-15 0:00 ` Fergus Henderson [this message]
-- strict thread matches above, loose matches on Subject: below --
1998-05-13 0:00 MSG
1998-05-13 0:00 ` Mark K. Gardner
1998-05-15 0:00 ` Jussi Santti
1998-05-13 0:00 ` Charles Hixson
1998-05-14 0:00 ` Eugene Mayevski
1998-05-13 0:00 ` John McCabe
1998-05-14 0:00 ` Mats Weber
1998-05-15 0:00 ` Nick Leaton
1998-05-15 0:00 ` Nick Roberts
1998-05-16 0:00 ` Tarjei T. Jensen
1998-05-15 0:00 ` Fergus Henderson
1998-05-15 0:00 ` Chris Miller
1998-05-15 0:00 ` Franck Arnaud
1998-05-15 0:00 ` Stephen Bull
1998-05-20 0:00 ` John Volan
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