Object[void*] wrappingRegistry;
but of course that prevents the wrapped objects from being
garbage collected - I need weak ref semantics.
I had a go at making it e.g.
ulong[ulong] and storing the cast(ulong) address of the D
object, but it seems that I don't understand what taking the
address of an obj (&obj) actually is doing - it doesn't seem to
point to the memory occupied by the object but instead to the
address of the variable pointing to the object?
class X {};
X x;
x is an reference to an instance of X, with other words a pointer
without arithmetic but with syntax sugar. &x will take the
address of this pointer/reference. If you want the address of the
actual instance, you can use cast(void*) for example.
