Why is D slower than LuaJIT?

[spir]

On Wed, 22 Dec 2010 23:22:56 -0600
Andrei Alexandrescu <SeeWebsiteForEmail at erdani.org> wrote:

> I'm thinking what to do about iota, which has good features but exacts 
> too much cost on tight loop performance. One solution would be to define 
> iota to be the simple, forward range that I defined as Iota2 in my 
> previous post. Then, we need a different name for the full-fledged iota 
> (random-access, has known length, iterates through the same numbers 
> forward and backward etc). Ideas?

I would keep length and add an opIn: if (e in interval) {...}. (I'm unsure whether it's worth allowing different types for bounds and/or for step; I'd rather make things simple.) Then, you could call it Interval, what do you think?

Note: The result would be very similar to python (x)ranges. D has a notation for a slightly narrower notion: '..'. Thus, what about:
	Interval!int interval = 1..9;
or else:
	auto interval = Interval!int(1..9);
?

What kind of thingie does "i..j" actually construct as of now?

Denis
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