Template class with dispatched properties

[Ross Hays]

> Strange. I'm getting a different error, but I'm still running 
> 2.063.2.
> The error I get is
> `Error: cannot resolve type for t.opDispatch!("x")`
> What version are you running?

I just updated to 2.064.2

> In any case, the reason apparently is multifold:
> 1. Apparently the proper error message isn't shown when using 
> the property notation. (I'd have to check to see if it happens 
> in 2.064 ... might be a fixed bug)
> 2. `.charAt(0)` doesn't exist for D's strings. You can just use 
> bracket notation to access the index.
> 3. When args is empty (as it will be for a getter, when you 
> call) args[0] doesn't exist, so `Error: array index [0] is 
> outside array bounds [0 .. 0]`
>
> So fix 2 and 3 and it works for getting x. The reason I use a 
> static if is to separate the cases where args has items and 
> when it does not (since args[0] is invalid when args.length == 
> 0), so that'll be necessary to get it to work.

Okay 2 is fixed, leftovers of other languages in my mind.
Also took care of 3 I think but I may still be missing something.

Here is what I have now..


class Vector(int N, T) if (N <= 3) {
     T[N] data;

     this()
     {
     	data[] = 0;
     }

     @property ref T opDispatch(string fieldName, Args ...)(Args 
args)
         if (Args.length < 2 && fieldName.length == 1 && 
toOffset(fieldName) < N)
     {
	    int offset = fieldName[0 .. 1] - 'x';
	    if (args.length != 0)
	    	return data[offset];
	    else
	    	return data[offset] = args[0];
     }
}

Same error.