Proposal: Make [][x] and [][a..b] illegal (reserve for multidimensional arrays)

Bill Baxter dnewsgroup at billbaxter.com
Thu Nov 22 02:52:13 PST 2007


Oskar Linde wrote:
> Bill Baxter wrote:
> 
>> Anyway, f[i][j][k] syntax is much more difficult to read than 
>> f[i,j,k].  So I think the latter is what we should be shooting for.
> 
> I agree, and for what it is worth it is possible to implement 
> multidimensional indexing and slicing for UDTs today. The only thing 
> lacking is the ability to use the .. and $ tokens. For example:
> 
> f[i, all, all, j, all, end-1, all, range(1, end)]
> 
> gets translated into quite optimal code. The only variables that get 
> passed to the indexing function is (i,j,1,1) and no temporaries need to 
> be created. I guess that with some additional compiler supported 
> sugaring, the above could become something like:
> 
> f[i, .. , .. , j, .. , $-1, .. , 1..$]
> 

Now if you would just put all that goodness on Dsource or somewhere 
where the rest of us can appreciate it... :-)

--bb



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