Adding pointers to GC with destructers

[Martin Nowak via Digitalmars-d-learn]

On Sunday, 19 April 2015 at 23:38:49 UTC, Freddy wrote:
> C libraries have a pattern of
> ----
> HiddenType* getObj();
> void freeObj(HiddenType*);
> ----
> Is there any way I can make the GC search for a "HiddenType*" 
> and run "freeObj" when the pointer is not found.

You can't turn an arbitrary pointer into a garbage collected 
object.
What you can do, is putting the pointer into a GCed object.

class Wrapper {
   this(HiddenType* p) { _p = p; } }
   ~this() { freeObj(_p); }
   alias _p this;
}

auto obj = new Wrapper(getObj());

Since 2.067.0 we also finalize heap allocated structs, so the 
wrapper can also be a struct.