Protected Data Members vs Public Data Members

Developers should use protected data members when designing class hierarchies where subclasses need direct access to certain data for extension or customization, such as in frameworks or libraries that allow inheritance for specialization meets developers should use public data members when designing simple data structures, such as plain old data (pod) classes in c++ or data classes in kotlin, where the primary purpose is to hold data without complex behavior. Here's our take.

Protected Data Members

Nice Pick

Developers should use protected data members when designing class hierarchies where subclasses need direct access to certain data for extension or customization, such as in frameworks or libraries that allow inheritance for specialization

Pros

• For example, in a game engine, a base 'GameObject' class might have protected health or position fields that derived 'Enemy' or 'Player' classes can modify
• Related to: object-oriented-programming, encapsulation

Cons

• Specific tradeoffs depend on your use case

Public Data Members

Developers should use public data members when designing simple data structures, such as Plain Old Data (POD) classes in C++ or data classes in Kotlin, where the primary purpose is to hold data without complex behavior

Pros

• It is also common in scripting languages like Python, where all members are public by default, to facilitate quick prototyping and reduce boilerplate code
• Related to: object-oriented-programming, encapsulation

Cons

• Specific tradeoffs depend on your use case

The Verdict

Use Protected Data Members if: You want for example, in a game engine, a base 'gameobject' class might have protected health or position fields that derived 'enemy' or 'player' classes can modify and can live with specific tradeoffs depend on your use case.

Use Public Data Members if: You prioritize it is also common in scripting languages like python, where all members are public by default, to facilitate quick prototyping and reduce boilerplate code over what Protected Data Members offers.

The Bottom Line

Protected Data Members wins

Developers should use protected data members when designing class hierarchies where subclasses need direct access to certain data for extension or customization, such as in frameworks or libraries that allow inheritance for specialization