This and Super operator in SV :

this is a handle to the current class object. Useful for accessing class members re-declared within a local scope super is a handle to the parent class object. Essential for accessing parent class members hidden in subclass For example, constructor Only 1 super allowed at a time. super.super.new() is illegal. The existence of a parent class can be tested for

class base;
  logic b1;
  protected logic c1;

  function new(input logic pone);
    b1 = pone;
  endfunction
endclass

class sub1 extends base;
  logic [1:0] b1;
  local integer length;

 function new(input logic pone);
   super.new(pone);
   this.b1 = super.b1;
  endfunction
endclass

class sub2 extends sub1;
 ...
 function new(input logic pone);
   super.new(pone);
 endfunction
endclass

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