Classes in D with betterC

[Stanislav Blinov]

On Sunday, 21 November 2021 at 20:30:51 UTC, Luís Ferreira wrote:

> I decided to have a simple approach just to show that it is 
> easier now to do that without workarounds, and by workarounds, 
> I mean using scope to fetch that info and use a fake dtor, or 
> even before scope exists, the usage of runtime-less D call with 
> betterC + objcopy, described 
> [here](https://theartofmachinery.com/2018/05/27/cpp_classes_in_betterc. html).

I get that the news part is all about `__traits(initSymbol)`, 
which in this case is about instantiating a class without 
druntime.

But that's just one line in the whole example. And the rest of 
the code? Construction may either fail altogether or cause 
unnecessary copies. Calling __dtor won't call destructors of base 
classes or derived classes. There may not even be a __dtor yet 
destruction may still be required through __xdtor, which still 
would not destruct base or derived classes. Deallocation can't be 
@trusted since you don't have a facility to prove that no other 
references exist. If anything, the code shows how NOT to use 
classes, contrary to what your title or preface say ;)
Even simple, an example should at least be correct, don't you 
think?