delegate !is null

[Steven Schveighoffer]

On Tue, 08 Sep 2009 16:15:49 -0400, Saaa <empty at needmail.com> wrote:


>>
>> // dg is now a "instanceless" delegate to C.method.
>>
>> dg.ptr = new C;
> So, nothing special under the hood, this would also work?
> C c= new C;
> dg.ptr = c;

Yes, same thing.

>> I also don't know how well it will work on interfaces.
> Very nice :)
> Might be useful, thanks.

Just be cautious.  You can get into undefined territory real easily,  
because dg.ptr is a void * (i.e. goodbye type system, I'm on my own!)

>>
>>> Kind of related:
>>> If you delete an object and later create a new object, what are the
>>> chances
>>> they are located on the
>>> same place (deleted.ptr is new.ptr) ?
>>> Does the garbage collector try to reuse locations or is it the opposite
>>> (or
>>> random) ?
>>
>> The chances are non-zero :)
> Are you quite sure there?

very quite.

> I'm only asking a single 'new'.
> I mean, there could be some heuristic which would prevent the a new  
> object
> to take the place of the latest deleted one.

There isn't.  Memory freed by the GC is able to be used in another  
allocation.  If this didn't happen, then it wouldn't take long to use up  
all the memory in the system.  I'm sure if you threw random shit at the GC  
long enough, it would do this :)

-Steve