Функция, возвращающая тип

// функция Chameleon, возвращающая тип сгенерированного исключения

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls;

type

  MyBoolean = class
  public
    Value: boolean;
  end;

  MyInteger = class
  public
    Value: integer;
  end;

  MyClass = class
  public
    Value: TStrings;
  end;

  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure MyProc;
    function Chameleon: boolean;
  end;

var

  Form1: TForm1;

implementation

{$R *.DFM}

function TForm1.Chameleon: boolean;
var

  b: MyBoolean;
  i: MyInteger;
  c: MyClass;
  r: integer;
begin

  r := Random(3);
  case r of
    0:
      begin
        b := MyBoolean.Create;
        raise b;
      end;
    1:
      begin
        i := MyInteger.Create;
        raise i;
      end;
    2:
      begin
        c := MyClass.Create;
        raise c;
      end;
  end;
end;

procedure TForm1.MyProc;
begin

  try
    Chameleon;
  except
    on MyBoolean do
      ShowMessage('Функция возвратила класс MyBoolean');
    on MyInteger do
      ShowMessage('Функция возвратила класс MyInteger');
    on MyClass do
      ShowMessage('Функция возвратила класс MyClass');
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin

  Chameleon;
end;

end.

function AnyType(const TypeParm: integer): Variant;
begin
  case TypeParm of
    1: Result := 1;
    2: Result := 2.0;
    3: Result := 'Три';
    4: Result := StrToDate('4/4/1944');
  end;
end;

{моя форма имеет 3 метки, одну кнопку и этот код}

var
  MyFuncRetInt: function(P1, P2: Integer): Integer;
  MyFuncRetBool: function(P1, P2: Integer): LongBool;
  MyFuncRetPointer: function(P1, P2: Integer): Pointer;

function MyFuncRetAnything(P1, P2: Integer): Integer;
var
  RetPointer: Pointer;
  RetBool: LongBool;
  RetInteger: Integer;
begin
  RetPointer := nil;
  RetBool := False;
  RetInteger := 4711;
  case P1 of
    1: Result := Integer(RetPointer);
    2: Result := Integer(RetBool);
    3: Result := RetInteger;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if MyFuncRetBool(2, 1900) then
    Label1.Caption := 'True'
  else
    Label1.Caption := 'False';
  Label2.Caption := IntToStr(MyFuncRetInt(3, 1900));
  Label3.Caption := IntToHex(Integer(MyFuncRetPointer(1, 1900)), 16);
end;

initialization
  MyFuncRetInt := @MyFuncRetAnything;
  MyFuncRetBool := @MyFuncRetAnything;
  MyFuncRetPointer := @MyFuncRetAnything;

end.