Delphi集合增删的另一种操作

D7

 

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
  TMyset001=set of (ss,aa,mm,tt);
var
  Form1: TForm1;
  Set01:TMyset001;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  Include(Set01,aa);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Include(Set01,ss);
  
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  Exclude(Set01,ss);
  Exclude(Set01,aa);
  Exclude(Set01,ss);
  if Set01=[] then
  begin
    //
  end;
end;

end.