$cast.sv - EDA Playground
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class base_class;
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  function void print();
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            $display("calling from parent class");
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  endfunction
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endclass
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​
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class child extends base_class;
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   function void print();
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     $display("calling from child class");
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  endfunction
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endclass
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module tb;
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  base_class base_o;
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  child ch1,ch2;
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    initial begin
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      ch1=new();
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      ch1.print();
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      base_o=new();
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      base_o = ch1;
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      base_o.print();
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      if($cast(ch2,base_o))begin
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        $display("casting is successfull");
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        ch2.print();
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      end
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         else
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           $error("casting is unsuccessfull");
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    end
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endmodule    
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