Classes and CTFE

[Andrea Fontana via Digitalmars-d-learn]

On Thursday, 10 March 2016 at 14:36:18 UTC, Adam D. Ruppe wrote:
> On Thursday, 10 March 2016 at 13:56:18 UTC, Andrea Fontana 
> wrote:
>> I used to think that classes can't be used with CTFE.
>
> Classes have worked normally with CTFE for several years now. 
> You don't need to do anything special with them.
>
>> Ex: http://dpaste.dzfl.pl/5879511dff02
>
> This just doesn't do what you think it does:
>
> if (__ctfe) pragma(msg, "compile-time");
>
> That will ALWAYS print the thing because if(__ctfe) is a *run 
> time* branch, and pragma(msg) is a compile time thing. The code 
> gets compiled, even if __ctfe == false, so it will print anyway.

Yes but in one case it will print only that message, if instanced 
at runtime it will print the other too. I was just verifing if 
ctor was called correctly (in a more complex code)

>
> enum forceCTFE(alias expr)=expr;
>
>
> That's only one way to do CTFE.

I just wanted to be sure it is ctfe.

> Notice the error message:
>
> variable p.forceCTFE!(willnot).forceCTFE : Unable to initialize 
> enum with class or pointer to struct. Use static const variable 
> instead.
>
>
>
> enums don't work in references, so you do a static variable 
> instead. Static variables are still CTFE'd.

So problem is actually enum, not ctfe. Nice. Thank you :)