freepascal.compiler/docs/refex/ex16.pp

Program Example16;

{ Program to demonstrate the Dispose and New functions. }

Type SS = String[20];
     
     AnObj = Object
       I : integer;
       Constructor Init;
       Destructor Done;
       end;

Var 
  P : ^SS;
  T : ^AnObj;
  
Constructor Anobj.Init;

begin
 Writeln ('Initializing an instance of AnObj !');
end;

Destructor AnObj.Done;

begin
  Writeln ('Destroying an instance of AnObj !');
end;
  
begin
  New (P);
  P^:='Hello, World !';
  Dispose (P);
  { P is undefined from here on !}
  New(T,Init);
  T^.i:=0;
  Dispose (T,Done);
end.