opDollar and infinite slices on infinite ranges

[Don]

Philippe Sigaud wrote:
> On Mon, Jul 19, 2010 at 03:03, Robert Jacques <sandford at jhu.edu 
> <mailto:sandford at jhu.edu>> wrote:
>  
> 
>     A well designed opDollar is still an enhancement request:
>     http://d.puremagic.com/issues/show_bug.cgi?id=3474. 
> 
> 
> Ah, OK.
>  
> 
>     However, there is a hack to get $ to return a value. Unfortunately,
>     I've lost that newsgroup post.
> 
> I got some May discussion about ^ and $ and a thread about opDollar for 
> multidimensional arrays, but couldn't find any concrete things on 
> opDollar. Strange, I thought that was part of DMD for a dozen releases. 
> I guess, I'm wrong, then :)

It's still planned to be implemented. The patch I made didn't have 
enough description for Walter to be comfortable with including it yet.

> 
> 
>  
> 
>     Memory got me this code snippet:
> 
> 
>     struct Bar {
>        int opIndex(int i) { writeln(i); return i; }
> 
>     }
>     int __dollar() { return 5;}
> 
> 
>     void main(string[] args) {
>        Bar b;
>        b[$];
>     }
> 
> 
> It works, but in this case $ is global symbol, defined outside Bar. If I 
> put it inside the struct, the compiler complains about  __dollar being 
> undefined.
> 
> Oh well, I'll push slices away from now, and use drop. Too bad, that 
> would have make some parts more elegant.
> 
> Thanks Robert,
> 
> 
>   Philippe
> 
> 
>