詳細測定Generics Collections TList(9):BinarySearch
1239 ワード
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<string>;
num: Integer;
b: Boolean;
Comparer: IComparer
;
begin
List := TList<string>.Create();
List.AddRange(['123', 'ABB', 'ABC']);
{ }
if List.BinarySearch('ABC', num) then ShowMessage(IntToStr(num)); {2}
{ , }
Comparer := TComparer<string>.Construct(
function(const s1,s2: string): Integer
begin
Result := Ord(s1[1]) - Ord(s2[1]);
end);
if List.BinarySearch('ABC', num, Comparer) then ShowMessage(IntToStr(num)); {1}
List.Free;
end;
end.