Segfault when using SysTime

[Jonathan M Davis]

On Friday, November 04, 2011 06:07 bearophile wrote:
> Jonathan M Davis:
> > and since CTFE can't handle classes - let alone one which is
> > initialized at compile time and then used at runtime
> 
> I think CTFE will handle classes in the next DMD version (and in the
> current GitHub one).

But it's not just a question of handling classes. It has to handle the case 
where the class persists during runtime. From what Don has said in the past, 
I'm pretty sure that supporting classes in CTFE is going to translate to being 
able to use functions that use classes but that none of the classes created 
will be able to be assigned to any variables which persist beyond compilation. 
It needs to become possible to do something like

static immutable _localTime = new immutable(LocalTime)();

For SysTime.init to be valid, LocalTime's instance must be created at compile 
time and persist beyond compilation, and then SysTime's _timezone member 
variable needs to be initialized to it - which would also persist beyond 
compilation.

If Don manages to make that work, that's fantastic, but there's a definite 
difference between being able to use classes with CTFE and initialize member 
and static variables with classes using CTFE, and it is my understanding that 
that we're only getting to use classes in CTFE, not persist them. But maybe 
we're lucky, and I'm wrong about that.

- Jonathan M Davis