Calling an alias for a Class method in another scope

[Jacob Carlborg]

On 2012-06-01 15:25, d coder wrote:
> Hello Steve, thanks for looking at this.
>
> I see the code works when I create the delegate first and then send it
> to template.  That is the way you do it here.
>
>     void main() {
>       Foo f = new Foo();
>       auto dg = &f.foo; // need to make a symbol so it can be aliased
>       callfoo!(dg)();
>     }
>
>
> But it does not work when I put &f.foo directly as the template
> argument. But it works when I say:
>
> void main() {
>    Foo f = new Foo();
>    callfoo!(() {f.foo();})(f);
> }
>
> But that still does not solve my problem. In my real code, I want to
> send the delegate to a template class. And I am supposed to do that as a
> member of another class. So the code looks something like:
>
> Class Bar(alias F) {
>   // Call F in some function here
> }
>
> Class Foo {
>    void foo();
>    Bar!(() {foo();}) bar;
> }
>
> Again this does not work. Maybe I am expecting too much from D. :-) I am
> somewhat aware of the issues involved here. I have seen some earlier D
> threads.
>
> But then I thought there might be a way to pass the method function
> literal (foo) and separately the this pointer of Foo object and then
> combine the two at the other end (inside Bar).
>
> Regards
> - Puneet
>

Originally you said "class method", so I was thinking like this:

class Foo
{
     static void bar ()
     {
         writeln("bar");
     }
}

void foo (alias m) ()
{
     m();
}

void main ()
{
     foo!(Foo.bar);
}

But if you actually mean "instance method" you need to use delegates and 
possible compose them as Steven showed.

-- 
/Jacob Carlborg