Which C++ operator is commonly used for runtime type checking and safe downcasting in a polymorphic class hierarchy?
Options
- A. static_cast
- B. dynamic_cast
- C. reinterpret_cast
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. dynamic_cast
Detailed Explanation
Correct Answer: Option BExplanation:
dynamic_cast can perform runtime-checked casts in appropriate polymorphic class hierarchies. For a failed pointer downcast it returns nullptr; for a failed reference cast it throws std::bad_cast. static_cast does not provide the same runtime check for downcasting.