//=========================================================================== 
// Organization : Individual developer 
// Filename     : tb.sv
// Author       : Feng Bohan
// Create Time  : 11:26:47 2025-03-18
// Last Modified: 11:27:17 2025-03-18
// Abstract     :  
//--------------------------------------------------------------------------
// Description:
// 
//--------------------------------------------------------------------------
// Modification History:
//--------------------------------------------------------------------------
// Rev      Date        Who         Description
// ---      ----        ---         -----------
// 0.0.01   2025-03-18  Feng Bohan  initial version
//===========================================================================
module tb();
   class BasePacket;
      int A; // 1;
      int B; // 2;
      int C; // 3;

      function new(int A=1, int B=2, int C=3);
         this.A=A;
         this.B=B;
         this.C=C;
      endfunction

      virtual function void printA;
         $display("[%m] A is %0d", A);
      endfunction
      virtual function void printB;
         $display("[%m] B is %0d", B);
      endfunction : printB
      function void printC;
         $display("[%m] C is %0d", C);
      endfunction : printC
   endclass : BasePacket
   class My_Packet extends BasePacket;
      int   A; // 4
      int 	B; // 5
      int   C; // 6

      function new(int A=4, int B=5, int C=6);
         this.A=A;
         this.B=B;
         this.C=C;
      endfunction

      /* -----\/----- EXCLUDED -----\/-----
      virtual function void printA;
         $display("A is %0d", A);
      endfunction
       -----/\----- EXCLUDED -----/\----- */
      virtual function void printB;
         $display("[%m] B is %0d", B);
      endfunction : printB
      function void printC;
         $display("[%m] C is %0d", C);
      endfunction : printC
   endclass : My_Packet

   initial begin
      BasePacket P1;
      My_Packet P2  = new;

      P1 = P2;   // P1 has a handle to a My_packet object
      $display("//******************** P1.print ********************");
      P1.printA; 
      P1.printB; 
      P1.printC; 
      $display("//**************************************************");

      $display("//******************** P2.print ********************");
      P2.printA; 
      P2.printB; 
      P2.printC; 
      $display("//**************************************************");
   end
endmodule // tb