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if you omit the call to the copy constructor in this example, both parameter and return_value would point to the same internal data, meaning that return_value would be an illegal additional reference to the same data structures.
if you omit the call to the copy constructor in this example, both parameter and return_value would point to the same internal data, meaning that return_value would be an illegal additional reference to the same data structures. whenever changes occurred in the data that parameter points to, return_value might be affected. thus, in order to create separate copies, the copy constructor must be used.