Re: Closures: summarizing suggestions a bit...

How about just # then? I think it looks fine.

Daniel Leuck wrote:
> Hi Slava,
> 
> @ will be used for attributes when 1.5 syntax is supported.  I suppose it
> would be unambiguous in some of the contexts you describe, but might be a
> bit confusing.
> 
> #'foo looks a little weird to me.
> 
> Dan
> 
> 
>>-----Original Message-----
>>From: beanshell-developers-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:beanshell-
>>developers-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Slava Pestov
>>Sent: Thursday, February 03, 2005 11:39 AM
>>To: BeanShell Developers
>>Subject: Re: [Beanshell-dev] Closures: summarizing suggestions a bit...
>>
>>Hi all,
>>
>>I suggest a syntax for closures, somewhat inspired by Common Lisp, where
>>refer to a function object, either named or anonymous, you write #'foo,
>>where foo is either a function name, or an anonymous function block
>>("lambda").
>>
>>While #' is a bit ackward, in BeanShell you can reserve the
>>currently-unused @ character to look up inside the function namespace --
>>giving the ability to have function object literals. Using @ in a C like
>>language is not that weird, and Objective C uses this character.
>>
>>So, suppose you had a function map() that took a list and a function,
>>and returned a new list. You could do:
>>
>>sq(x) { return x*x; }
>>
>>map(list,@sq);
>>
>>For anonymous closures, just use a syntax like
>>
>>map(list,@(x) { return x*x; });
>>
>>So its @(arguments) { body }
>>
>>(in Common Lisp, its #'(lambda (x y) (+ x y)) -- notice the parallel...).
>>
>>Now, I missed method literals. What you could do is return an object
>>that is internally a pair; a 'this', and a BeanShell method to invoke.
>>So the syntax could be like:
>>
>>map(list,myObj.@foo);
>>
>>Where myObj.@foo is an object that when called in some way, invokes
>>myObj.foo(...).
>>
>>To call a method, function or closure, i think its ok to call the 'do'
>>method on it, like in SmallTalk.
>>
>>void map(list,closure)
>>{
>>     for(i = 0; i < list.size(); i++)
>>         list.set(i,closure.do(list.get(i)));
>>}
>>
>>I hope my proposal is considered. I think overloading an unused
>>punctuation character is the best way to implement anonymous closures
>>and methods-as-arguments while maintaining brevity, without creating
>>ambiguous situations.
>>
>>Patrick Niemeyer wrote:
>>
>>>Just to summarize a few of the alternate suggestions:
>>>
>>>// Extended method-like syntax:
>>>callable( ... );
>>>callable( arg, ... );
>>>
>>>
>>>// Anonymous inner class-like syntax:
>>>() { ... }
>>>(arg) { ... }
>>>
>>>
>>>// Multiple curly brace syntax:
>>>{{ ... }}
>>>{ arg { ... } }
>>>
>>>
>>>
>>>Pat
>>>
>>>
>>>
>>>-------------------------------------------------------
>>>This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
>>>Tool for open source databases. Create drag-&-drop reports. Save time
>>>by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
>>>Download a FREE copy at http://www.intelliview.com/go/osdn_nl
>>>_______________________________________________
>>>Beanshell-developers mailing list
>>>Beanshell-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>>>https://lists.sourceforge.net/lists/listinfo/beanshell-developers
>>
>>
>>
>>-------------------------------------------------------
>>This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
>>Tool for open source databases. Create drag-&-drop reports. Save time
>>by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
>>Download a FREE copy at http://www.intelliview.com/go/osdn_nl
>>_______________________________________________
>>Beanshell-developers mailing list
>>Beanshell-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>>https://lists.sourceforge.net/lists/listinfo/beanshell-developers
> 
> 



-------------------------------------------------------
This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
Tool for open source databases. Create drag-&-drop reports. Save time
by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
Download a FREE copy at http://www.intelliview.com/go/osdn_nl