foreach change for multi-dimensional data

[ixid via Digitalmars-d-learn]

On Thursday, 28 January 2016 at 15:38:20 UTC, Ali Çehreli wrote:
> On 01/28/2016 05:33 AM, ixid wrote:
> > This is an idle thought hence putting it on the Learn-level
> forum. An
> > idea struck me for foreach to make working with more
> complicated data
> > types or heavily nested data easier.
> >
> >
> >      uint[][] a = [[1,2,3],[4,5,6]];
>
> [...]
>
> > It would be nice if you could do something like this:
> >
> >      foreach(uint c; a)
> >          c.writeln;
>
> It looks like Solomon E's recent collapse() is what we need 
> here:
>
>   
> http://forum.dlang.org/post/xihlsfgfpykdvmvrggyr@forum.dlang.org
>
>     foreach(c; a.collapse)
>         // ...
>
> Ali

That's a much more limited version of what I'm suggesting in that 
it just collapses until something isn't an array any more, 
sometimes you might only want to collapse two levels and get up 
with something that's still an array type or you will be getting 
members in struct that's in an array.

I've written something similar for myself that will collapse 
until a provided type is matched or the first argument type of a 
provided function is matched and apply the function.