Adam D. Ruppe's "D Cookbook" now available!

[Szymon Gatner via Digitalmars-d-announce]

On Wednesday, 28 May 2014 at 18:14:28 UTC, Walter Bright wrote:
> http://www.packtpub.com/discover-advantages-of-programming-in-d-cookbook/book
>
> http://www.amazon.com/D-Cookbook-Adam-D-Ruppe/dp/1783287217
>
> http://www.reddit.com/r/programming/comments/26pn00/d_cookbook_officially_published_consists_of_d/
>
> After watching Adam's most excellent presentation at Dconf, I'm 
> sure the book will be great! My copy gets here on Friday.

A question(s) regarding Chapter 5: Making a reference-counted 
object:

(btw do we need separate thread for content-related questions?)

- point 5 (of How to do it...) says: "... and free the object if 
necessary", but then in code:

~this() {
   if(data is null) return;
   data.refcount--;
   writeln("Released. Refcount = ", data.refcount);
   if(data.refcount == 0)
   writeln("Destroyed.");
}

is actual freeing missing? Or am I missing something?

Later in same chapter: "... or being collected by the garbage 
collector—its destructor is called, if present."

Is that really true? My understanding (and unfortunate test) is 
that it is never guaranteed that d-tor of GD allocated object is 
ever called. If that is the case then: is that true that dynamic 
array of RefCountedObject does not guarantee any of d-tors 
called? That would also mean that if any of objects in object 
graph is GC-allocated then NONE of its child nodes have any 
guarantees about destruction?