Creational Design Patterns in Modern C++ - Singleton Issues

The video tutorial discusses the issues associated with the Singleton design pattern, particularly its violation of the dependency inversion principle and challenges in unit testing. It demonstrates a basic implementation of a Singleton class called 'local printer' and highlights the problems of direct usage in code. To address these issues, the tutorial suggests using inheritance to create a more flexible design that allows for different types of printers and easier unit testing with mock objects. The approach enhances flexibility and adheres to better design principles.

What is a major criticism of the Singleton design pattern?

• It is not suitable for large projects.

• It violates the dependency inversion principle.

• It is too complex to implement.

• It requires too much memory.

Why is it difficult to replace a Singleton class with another class?

• Because it requires special permissions.

• Because it is too expensive to replace.

• Because it is not compatible with other classes.

• Because it is tightly coupled with the code.

What is the purpose of the 'local printer' class in the example?

• To print documents over a network.

• To demonstrate a Singleton implementation.

• To replace the Singleton pattern.

• To manage multiple printers.

How can the issues with Singleton be addressed according to the video?

• By inheriting from a base class.

• By using multiple Singleton instances.

• By avoiding the use of printers.

• By using only local printers.

What is a benefit of using inheritance and abstraction in the new approach?

• It reduces the code size significantly.

• It allows for easier unit testing.

• It eliminates the need for printers.

• It increases the speed of printing.

How does the new approach help in unit testing?

• By making tests run faster.

• By reducing the number of test cases.

• By allowing the creation of mock objects.

• By eliminating the need for tests.

What flexibility does the new approach provide?

• It allows for different types of printers.

• It enables faster printing speeds.

• It reduces the cost of printing.

• It supports multiple Singleton instances.