Use as events

New features since Delphi 7 > Anonymous Methods > Use as events

Method reference types can be used as a kind of event in Delphi and become std::function's by translation to C++.

type

  TAnProc = Reference to procedure;

  TAn4Component = class(TComponent)

  private

    FMyEvent: TAnProc;

  public

    property MyEvent: TAnProc Read FMyEvent Write FMyEvent;

  end;

procedure TestAnonymous4;

var

  C : TAn4Component;

begin

  C := TAn4Component.Create;

  C.MyEvent := procedure

  begin

    ; 

  end;

end;

->

typedef std::function<void ()> TAnProc;

class TAn4Component : public System::TComponent

{

  typedef System::TObject inherited;

private:

  TAnProc FMyEvent;

public:

  /*property MyEvent : TAnProc read FMyEvent write FMyEvent;*/

  TAnProc ReadPropertyMyEvent() { return FMyEvent;}

  void WritePropertyMyEvent(TAnProc Value){FMyEvent = Value;}

public:

  TAn4Component() {}

};

void TestAnonymous4()

{

  TAn4Component* C = nullptr;

  C = new TAn4Component();

  C->WritePropertyMyEvent([&]() -> void {

  ;

});

}

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