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Calling base class constructors and destructors

 

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If you're writing a derived-class constructor, you'll want to pass the constructor parameters to the base class constructor, as in this example:

constructor TMyButton.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  { do custom things... }
end; 

However, if your derived-class constructor has the same parameters as the base class constructor, you don't have to specify the constructor method name or parameters, and you can simply write:

constructor TMyButton.Create(AOwner: TComponent);
begin
  inherited;
  { Do custom things... }
end; 

Destructors: you usually should first free your custom allocated members etc. and then call the derived destructor:

destructor TMyButton.Destroy;
begin
  { imagine, you'd have an TStringList member variable }
  aStringList.Free;
  inherited;
end;


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