詳細測定Generics Collections TList(8):Sort

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses Generics.Collections, Generics.Defaults;

procedure TForm1.Button1Click(Sender: TObject);
var
  List: TList<Integer>;
  i: Integer;
  str: string;
begin
  List := TList<Integer>.Create();
  List.AddRange([22,33,11]);

  str := '';
  for i in List do str := str + IntToStr(i) + ' '; 
  ShowMessage(str); {22 33 11 }

  { }
  List.Sort;
  str := '';
  for i in List do str := str + IntToStr(i) + ' '; 
  ShowMessage(str); {11 22 33 }

  { }
  List.Sort(TComparer<Integer>.Construct(
    function (const n1,n2: Integer): Integer
    begin
      Result := n2 - n1;
    end));

  str := '';
  for i in List do str := str + IntToStr(i) + ' '; 
  ShowMessage(str); {33 22 11 }

  List.Free;
end;

end.