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//-------------------------------------------------------------------------
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//                      www.verificationguide.com
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//-------------------------------------------------------------------------
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class packet;
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  bit [31:0] addr;
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  bit [31:0] data;
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  //task declaration - extern indicates out-of-body declaration
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  extern virtual task display();
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endclass
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​
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//task implementation outside class body
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task packet::display();
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  $display("Addr = %0d Data = %0d",addr,data);
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endtask
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module extern_method;
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  initial begin
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    packet p;
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    p = new();
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    p.addr = 10;
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    p.data = 20;
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    p.display();
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  end
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endmodule
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