Need I to put overload or override words after the constructor declaration in derived class?

Question

I have a class hierarchy, this one:

type
TMatrix = class
    protected
      //...
    public
      constructor Create(Rows, Cols: Byte);
    //...
type
  TMinMa         


        

Answer 1

You need overload for both constructors if they have the same name.

type
  TMatrix = class
  protected
    //...
  public
    constructor Create(Rows, Cols: Byte);
    //...
type
  TMinMatrix = class(TMatrix)
  public
    constructor Create(Rows, Cols: Byte); overload;
    constructor Create(var that: TMinMatrix); overload;
  end;

It is good practice to call the inherited constructor.

constructor TMinMatrix.Create(Rows, Cols: Byte);
begin
   inherited Create(Rows, Cols); // Need to call the full name if the parameters are changed.
   //...
end;