class procedure

[aliotti]

 I have the code down:

     TXYZ = class ...
                    public
                        class procedure ax(a,b,c:string);
                    end;

   and in another file do:
  type
      TprocX = procedure ay(a,b,c:string) of object;


  .... and more down

onAbc:TprocX;


onAbc := @TXYZ.ax(a,b,c:string);

When It is compiled return message :

<filename>.pas(X,Y) Error: Incompatible types: got "<class method type of procedure(a,b,c:string) of object;Register>" expected "<procedure variable type of procedure(a,b,c:string) of object;Register>"

any idea how correct it.

[howardpc]

You've declared TprocX (and thus onABC) as a method variable, not as a class method variable, so it is not assignment compatible with a class method address.
If you create an instance of TXYZ
var aXYZ: TXYZ;
aXYZ := TXYZ.Create;
then onABC will be assignment compatible with the 'normal' method address, @aXYZ.ax(...)

[User137]

onAbc := @TXYZ.ax(a,b,c:string);

Assignment doesn't look right. This?

Code: [Select]

onAbc := @TXYZ.ax;

[circular]

What about :

Code: [Select]

TprocX = class procedure ay(a,b,c:string) of object;