You are designing a complex numerical algorithm with multiple cooperating classes that need to share internal data for efficiency. How might the friend keyword be used effectively in this context?
- Use the friend keyword for all member functions.
- Limit the use of friend to only those classes/functions that strictly require access.
- Use the friend keyword with external utility functions only.
- Declare all classes as friends of each other.
The friend keyword should be used judiciously. By limiting its use only to those classes or functions that genuinely need access, you maintain a degree of encapsulation and make the design intent clear, ensuring that only necessary components have deeper access.
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