[Lazarus] Best practices on using classes for subroutine libraries

[Joao Morais]

On Sat, Apr 14, 2012 at 04:23, Frank Church <vfclists at gmail.com> wrote:
> Is it possible to make them virtual and override them or replace them
> in descendant classes?

======>>>======

{$mode objfpc}
type
  tfooclass = class of tfoo;

  tfoo = class
  public
    class function m1: string; virtual;
  end;

  tbar = class(tfoo)
  public
    class function m1: string; override;
  end;

class function tfoo.m1: string;
begin
  Result := 'tfoo';
end;

class function tbar.m1: string;
begin
  Result := 'tbar';
end;

var
  vclass: tfooclass;
begin
  vclass := tfoo;
  writeln('1: ', vclass.m1);
  vclass := tbar;
  writeln('2: ', vclass.m1);
end.

======<<<======

Joao Morais