Delphi open array as property index in indexed property

Question

Is it possible to use an open array as index type for indexed properties?

unit OpenArrayAsPropertyIndex;

interface

type

  TFoo = class
  private
    function getBar(Index: array of Integer): String;
  public
    // [DCC Error]: E2008 Incompatible types
    property Bar[Index: array of Integer]: String read getBar;
  end;

implementation

function TFoo.getBar(Index: array of Integer): String;
begin

end;

end.

The property getter is generated by pressing Ctl+Shift+C in the IDE, but this code doesn't compile and gives error "E2008 Incompatible types". So, is it a language limitation, or what is the correct parameter signature for the getter?

Answer 1

Instead of array of Integer use TIntegerDynArray from System.Types or a similar self declared type.

type
  TIntArray = array of Integer;
  TFoo = class
  private
    function getBar(Index: TIntArray): String;
  public
    property Bar[Index: TIntArray]: String read getBar;
  end;

function TFoo.getBar(Index: TIntArray): String;
begin

end;