Object Pointer

[Namespace]

I'm just experiement with D, that's all. ;)
Most of my questions here are just out of curiosity.

I have now this construct:

[code]
class smart_ptr {
private:
	A* _ptr;

public:
	this(A* ptr) {
		void* buffer = GC.malloc(A.sizeof);
		memcpy(buffer, ptr, A.sizeof);

		this._ptr = cast(A*) buffer;
	}

	~this() {
		GC.free(this._ptr);
	}

	@property
	A* Ptr() {
		return this._ptr;
	}

	alias Ptr this;
}
[/code]

And that is how i use it (ATM):

[code]
A a = new A(42);
smart_ptr sptr = new smart_ptr(&a);
sptr.echo();

a = null;

sptr.echo();
[/code]

But how can i free the memory?
Bizarrely it cannot be delete in the dtor. o.O
Strange design.