On Wed, Nov 06, 2013 at 11:52:56PM +0100, Namespace wrote:
> On Wednesday, 6 November 2013 at 22:43:18 UTC, Dicebot wrote:
> >On Wednesday, 6 November 2013 at 22:41:08 UTC, Atila Neves wrote:
> >>I know, but I keep having to refer back to that and even then I
> >>didn't know about the syntax these guys just posted! ;)
> >
> >Well, it is mentioned in the list of `is` usage cases down that
> >link. It is very ugly part of the language but definitely worth
> >spending some time to carefully investigate all the patterns -
> >damn powerful stuff.
>
> There are so much more uglier things ... :P
> Take a look at the scoped or ref counted implementation.
Are you sure about that? Do you know that this does?
int func(ref int x, string y, float z = 3.14159) { ... }
// This is possibly the single nastiest bit of syntax in all of D:
static if (is(func X == __parameters)) {
// Quick, without looking at the docs: what does X refer
// to?
// If you manage to figure that one out, can you say
// with certainty what's the type of X? Are you sure? :P
alias Y = X[0];
// Quick, without looking at the docs: what is Y?
// (If your answer was, the first element of X, you're
// wrong!)
// Quiz: how do you get a single element of X? (And no,
// X[i] is the wrong answer, see above.)
// If you got it right thus far: how do you access the
// name of a single element of X? The default value?
// (Note: if you didn't get the previous questions
// right, don't even attempt this one; it's one of those
// things that nobody can possibly guess unless they've
// seen it before.)
}
Almost every part of the above is so completely counterintuitive and
impossible to predict from the syntax that I honestly doubt if the
scoped or RefCounted implementation could beat it for ugliness. :P
T
--
Notwithstanding the eloquent discontent that you have just respectfully
expressed at length against my verbal capabilities, I am afraid that I must
unfortunately bring it to your attention that I am, in fact, NOT verbose.
