Complete Modern C++ - Project – Part X (dynamic_cast)

The video tutorial explains downcasting in C++ using type ID and dynamic cast, highlighting the differences and use cases for each. It covers how dynamic cast can be used with pointers and references, and the implications of null checks and exception handling. The tutorial also discusses the drawbacks of using RTTI, such as performance overhead, and suggests relying on polymorphism instead. The video concludes with a recommendation to avoid RTTI and dynamic cast where possible.

What is the primary purpose of using type ID in downcasting?

• To check if an object is null

• To determine the type of an object at runtime

• To increase the speed of the program

• To convert an object to a string

What does dynamic cast return if the type cast cannot be performed?

• A default value

• The original object

• An exception

• Null

How does dynamic cast behave differently with references compared to pointers?

• It returns null for references

• It throws an exception for references

• It does not work with references

• It performs the cast automatically

What type of exception is thrown when a dynamic cast with references fails?

• InvalidReferenceException

• BadCastException

• TypeMismatchException

• NullPointerException

Why should the use of type ID and dynamic cast be avoided?

• They do not work with polymorphic classes

• They are difficult to implement

• They add runtime overhead due to RTTI

• They are not supported in all compilers

What is the recommended alternative to using RTTI for invoking correct behavior?

• Using static variables

• Relying on polymorphism

• Implementing custom type checks

• Using global functions

What is the main disadvantage of using dynamic cast compared to type ID?

• It requires more memory

• It cannot be used with pointers

• It is slower

• It is less accurate