Don't expect class destructors to be called at all by the GC

[user1234]

On Thursday, 21 December 2017 at 02:57:00 UTC, Mike Franklin 
wrote:
> "Don't expect class destructors to be called at all by the GC"
>
> I was a bit shocked to read that here: 
> https://p0nce.github.io/d-idioms/#The-trouble-with-class-destructors
>
> The document tries to clarify with:
> "The garbage collector is not guaranteed to run the destructors 
> for all unreferenced objects."
>
> Unfortunately, that doesn't really shed much light on this 
> oddity.  So, specifically, under what circumstances are 
> destructors not called?
>
> Thanks,
> Mike

When the GC is unaware of a class instance (an "unreferenced 
object") it won't call its destructor. This happens when you use 
alternative memory management strategy, for example using 
Mallocator and make you get an unreferenced object that you have 
to manage yourself.