Flag proposal

[Andrei Alexandrescu]

On 6/10/11 8:08 PM, Michel Fortin wrote:
> On 2011-06-10 18:57:20 -0400, Andrei Alexandrescu
> <SeeWebsiteForEmail at erdani.org> said:
>
>> On 6/10/11 5:25 PM, Michel Fortin wrote:
>>> A hack is something that works even though it's ugly and generally cause
>>> people to call for something better. I'm not opposed to using hacks as
>>> long as they're well-encapsulated and not too fragile, but in this case
>>> I find the encapsulation is leaky since you need to litter your code
>>> with Flag!"" everywhere.
>>
>> https://github.com/andralex/phobos/commit/84c75336a4ef04b4c3b1924d7ac9329e744ab8e7
>>
>
> It's
>>
> still a hack, but I'll agree it makes the encapsulation a little better
> if you use yes!"abc" at the function call point.
>
> However, I still think it's a deterioration from the user's point of
> view compared to the current situation with hand-crafted enums: it still
> requires a string, and the documentation will say func(Flag!"abc" abc),
> repeating the parameter's name unless you hand-craft a special Ddoc
> version of the function declaration. It's better than Flag!"abc".yes,
> but it's worse than Abc.yes.

But the problem is the same today.

enum Abc : bool { no, yes }
void fun(Abc abc = Abc.no);

No difference. In the function declaration, the word "abc" occurs three 
times.


Andrei