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Can you think of a good reason to avoid writing statements in a class member function that use cout or cin?
Wiki User
∙ 8y ago
Writing statements in a class member function that use cout or cin is not recommended because it binds your class to the (global) standard IO streams, which is rarely a good idea. It goes against the OOP paradigm which encourages generalisation and where independent classes should express independent notions independently.
Class member functions should only be implemented when those functions operate solely upon the class itself, which primarily refers to class mutators (assignment operators and other "setters") as well as accessors ("getters"). If a class member function mutates a stream, then that function is really operating upon two classes simultaneously and should really be declared external to both, perhaps as a friend function if it also requires private access to the class representation.
With a well-designed class hierarchy, overloading the operator<< and operator>> operators usually suffices for most streaming requirements. If you require something more specialised, consider exposing a protected interface and allow users to provide their own implementations rather "hard wiring" your own.
Wiki User
∙ 8y ago
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