delegate reference

[Ary Borenszweig]

Saaa wrote:
> "Daniel Keep" <daniel.keep.lists at gmail.com> wrote in message 
> news:h88cck$1orc$1 at digitalmars.com...
>>
>> Saaa wrote:
>>> abstract class C
>>> {
>>>  int method();
>>> }
>>> class C2:C
>>> {
>>>  int method() return 2;
>>> }
>>> class C3:C
>>> {
>>>  int method() return 3;
>>> }
>>> int delegate() deleg;
>>> void main()
>>> {
>>>  C c;
>>>  C2 c2 = new C2;
>>>  C3 c3 = new C3;
>>>  c=c2;

c --> c2.method
         ^
         |
deleg ---

>>>  deleg = &c.method;
>>>  writefln(deleg()); // 2
>>>  c=c3;

Now:

c --> c3.method

       c2.method
         ^
         |
deleg ---

>>>  writefln(deleg()); // 2
>>>  // I expected this to write 3, why is this not so?
>> Because you didn't reassign deleg.
> but isn't deleg pointing to c's method?

Yes, to previous c's method. See above.

Remember that a delegate is a pair: an instance and it's method. You 
can't just point to a class' method, you are always pointing to a 
instance's method.

(that's why my arrows point to the dot :-P)