
Concept explainers
Suppose you wish to add a friend function to the class DayOfYear defined in Display 11.2. This friend function will be named after and will take two arguments of the type DayOfYear. The function returns true if the first argument represents a date that comes after the date represented by the second argument; otherwise, the function returns false. For example, February 2 comes after January 5. What do you need to add to the definition of the class DayOfYear in Display 11.2?

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