[Issue 9065] Please consider adding these std.traits

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http://d.puremagic.com/issues/show_bug.cgi?id=9065



--- Comment #21 from Manu <turkeyman at gmail.com> 2012-11-26 23:24:17 PST ---
(In reply to comment #20)
> (In reply to comment #12)
> > (In reply to comment #11)
> 
> OK. I understood that Manu says. And my yesterday comment was completely wrong.
> Sorry for my misunderstanding.
> 
> Certainly, isFunction is an important template which lacks in std.traits.
> Existing other function traits, isSomeFunction, isCallble, FunctionTypeOf,
> return true even if given function pointer or delegate. I can agree with the
> behavior is sometimes obstacle.
> 
> > Blending traits about type and symbol is not a purpose of std.traits.
> 
> And more, mixing symbol and type is *a design* of std.traits. I had
> misunderstood at the point. isSomeFunction is an example.
> 
>   /**
>   Detect whether >>symbol or type<< $(D T) is a function, a function pointer
>   or a delegate.
>    */
>   template isSomeFunction(T...) { ... }
> 
> I challenged implementing proposed template isVariable. Is this what you want?
> 
> https://gist.github.com/4152297

It looks good, although I can't test it now.
Does isVariable deal with properties (which I would say are NOT variables). And
how about an isProperty? That's really hard to detect...

I'm not sold on the term isManifestConstant, I'm sure no non-compiler developer
would have ever heard that term before. I've never seen it in any docs before,
and they're declared with 'enum', that's what most people will call it.

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