delegate !is null

[Steven Schveighoffer]

On Fri, 04 Sep 2009 14:33:12 -0400, Saaa <empty at needmail.com> wrote:

> class C
> {
>   private int i;
>   int method()
>   {
>     return i;
>   }
> }
>
> class D
> {
>   private int delegate(void) _deleg;
>   this(int delegate(void) d)
>   {
>     _deleg = d;
>   }
>   void write()
>   {
>     if(_deleg !is null)
>     }
>       writef(_deleg());
>     }
>   }
> }
> C c = null;
> D d = new d;
> d.function(c.method());
> //This fails, as method is not availible for null.
> d.function({return c.method();});
> //This works but now I can't check whether c is null or not.
> d.write(); //will fail.
>
> Any suggestions?

Maybe you could rephrase your question in english.  I can't really  
understand what you are trying to do with this code.

i.e. "I want to be able to tell whether a delegate is null or not, how do  
I do that".  But you do that just like you said -- dg !is null.

-Steve