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Automatic Reference Counting in Delphi

Discussion in 'Delphi Programming' started by N0body, Sep 11, 2014.

  1. N0body
    Online

    N0bodyN0body is a Verified Member DelphiFan Administrator Staff Member DF Staff

    a tiny module to manage a 'garbage collector' in Delphi ... :)


    Code:
    unit MemoryGuard;
    
    interface
    
    type
    { IGuardObject }
    IGuardObject = interface(IUnknown)
    function Obj : Pointer;
    end;
    
    function Guard(aInstance : TObject) : IGuardObject;
    
    implementation
    
    type
    { TGuardObject }
    TGuardObject = class(TInterfacedObject, IGuardObject)
    private
    fInstance : TObject;
    public
    function Obj : Pointer;
    constructor Create(aInstance : TObject);
    destructor Destroy; override;
    end;
    
    { TGuardObject }
    
    // _____________________________________________________________________________
    constructor TGuardObject.Create(aInstance : TObject);
    begin
    fInstance := aInstance;
    end;
    
    // _____________________________________________________________________________
    destructor TGuardObject.Destroy;
    begin
    fInstance.Free;
    inherited;
    end;
    
    // _____________________________________________________________________________
    function TGuardObject.Obj : Pointer;
    begin
    result := fInstance;
    end;
    
    // _____________________________________________________________________________
    function Guard(aInstance : TObject) : IGuardObject;
    begin
    result := TGuardObject.Create(aInstance);
    end;
    
    end.
    
    ============================================================================
    
    // ReportMemoryLeaksOnShutdown := true; => in project source
    
    // _____________________________________________________________________________
    procedure TForm24.FormCreate(Sender : TObject);
    begin
    // create a TStringlist with 'Guard'
    list := Guard(TStringlist.Create).obj;
    fill1; // fill list
    
    // show content
    ShowMessage( 'Message 1'#13#10 + list.Text );
    // list.Free => no need to release the object
    
    // exemple 2
    list := Guard(TStringlist.Create).obj;
    list.Add('---------------');
    list.Add('memory frees itself');
    list.Add('---------------');
    
    // show content
    ShowMessage( 'Message 2'#13#10 + list.Text );
    // list.Free => no need to release the object
    end;
    
    // _____________________________________________________________________________
    procedure TForm24.fill1;
    var
    i : integer;
    begin
    for i := 0 to 10 do
    list.Add('item ' + IntToStr(i));
    end;
    
     
  2. serdarbala
    Online

    serdarbala Guest

    RE:

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