Class destructors - clarify what is safe

[Forum User]

On Saturday, 14 February 2026 at 18:42:21 UTC, H. S. Teoh wrote:
>> When entering a class destructor, are any of the dynamically 
>> allocated class members safe to read?
>
> No.  The order in which the GC deallocates objects is not 
> defined, and when the dtor is run, any references to 
> GC-allocated objects cannot be safely read, as those objects 
> may have already been destroyed.

Does this deviate from the way C++ handles destruction?

https://stackoverflow.com/questions/20045904/c-can-i-use-this-safely-in-a-destructor

Quote:

"    Can I use this in a destructor

Yes.

     For example, I know I'm not supposed to do anything with base 
classes, since they are gone.

No, the base classes are still intact at this point. Members (and 
perhaps other base classes) of derived classes have already been 
destroyed, but members and base classes of this class remain 
until after the destructor has finished."

I thought that also in D all the members and the base objects of 
the object which is destructed are still valid and accessible 
until the destructor finished.