The built-in copy () method executes the __m_uvm_field_automation() method with the required copy code as defined by the field macros (if USED) and then calls the built-in do copy() virtual FUNCTION. The built-in do copy () virtual function, as defined in the uvm_object base class, is also an empty method, so if field macros are used to define the fields of the transaction, the built-in copy() method will be POPULATED with the proper code to copy the transaction fields from the field macro definitions and then it will execute the empty do copy() method, which will perform no additional activity.

The copy() method can be used as needed in the UVM test BENCH. One common place where the copy() method is used is to copy the sampled transaction and pass it into a sb_calc_exp() (scoreboard calculate expected) external function that is frequently used by the scoreboard predictor.

The CLONE () method calls the create () method (constructs an object of the same type) and then calls the copy() method. It is a one-step command to create and copy an existing object to a new object handle.

The built-in copy () method executes the __m_uvm_field_automation() method with the required copy code as defined by the field macros (if used) and then calls the built-in do copy() virtual function. The built-in do copy () virtual function, as defined in the uvm_object base class, is also an empty method, so if field macros are used to define the fields of the transaction, the built-in copy() method will be populated with the proper code to copy the transaction fields from the field macro definitions and then it will execute the empty do copy() method, which will perform no additional activity.

The copy() method can be used as needed in the UVM test bench. One common place where the copy() method is used is to copy the sampled transaction and pass it into a sb_calc_exp() (scoreboard calculate expected) external function that is frequently used by the scoreboard predictor.

The clone () method calls the create () method (constructs an object of the same type) and then calls the copy() method. It is a one-step command to create and copy an existing object to a new object handle.