Mega Code Archive
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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