The idea is strange. But here it is:

Is possible to have a Class constant with different values in class descendants ?

Would be something like that:

TA = class
const
        c1: integer; virtual;
        class function GetC1: integer; //returns c1
end;
TB = class(TA)
const
        c1: integer = 1;
end;
TC = class(TA)
const
        c1: integer = 2;
end;

Funny coincidence, I was looking for the same thing today :)

Michael.

Daniel Gaspary wrote

Is possible to have a Class constant with different values in class descendants ?

Afaik no, but you can override class virtual methods which might give you the correct value:

  TA = class
  protected
    class function value: integer; virtual; abstract;
  public
    class function getvalue: integer;
  end;
  TB = class(TA)
  protected
    class function value: integer; override;
  end;
  TC = class(TA)
  protected
    class function value: integer; override;
  end;

Joao Morais

Joao Morais wrote

Afaik no, but you can override class virtual methods which might give you the correct value:

Exactly what I was trying to avoid. :)

currently I use a dirty hack to achieve something like this: I have a fixed naming scheme for the classname and encode the "virtual" const in the classname.