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unit getterexample1;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
type
{ TOldest }
TOldest = class
private
FBar: integer;
function GetBar: integer; virtual;
public
property Bar: integer read GetBar;
end;
{ TOlder }
TOlder = class(TOldest)
private
function GetBar: integer; override;
public
procedure DoSomething;
function GetOldest(Older: TOlder): TOldest;
end;
implementation
{ TOldest }
function TOldest.GetBar: integer;
begin
Result:=FBar;
end;
{ TOlder }
function TOlder.GetBar: integer;
begin
Result:=FBar;
end;
procedure TOlder.DoSomething;
var
Older: TOlder;
begin
Older:=TOlder.Create;
with TOlder(Older) do
writeln(Bar);
with Older.GetOldest(Self) do
writeln(Bar);
end;
function TOlder.GetOldest(Older: TOlder): TOldest;
begin
Result:=Older;
end;
end.
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