Creational Design Patterns in Modern C++ - Using the Factory Method

The video tutorial discusses the limitations of using macros and conditional statements for creating database instances, leading to tightly coupled and inflexible code. It introduces the factory method design pattern to decouple the client code from specific database classes. The implementation of the factory method is detailed, highlighting its benefits in creating instances without depending on concrete types. However, the method's limitation in ensuring consistent database instances is noted. To address this, the abstract factory design pattern is introduced, which allows for creating instances from a specific database set, ensuring consistency and flexibility.

What problem does the factory method design pattern aim to solve?

• It eliminates the need for any design patterns.

• It helps in creating instances of classes without depending on their concrete types.

• It ensures that all instances are from the same database.

• It allows for the direct modification of database classes.

How does the factory method reduce dependency on specific class names?

• By removing all class names from the code.

• By hardcoding class names in the application.

• By implementing factory methods that create instances based on a specified type.

• By using macros to define class names.

What is a limitation of the factory method design pattern?

• It is only applicable to SQL databases.

• It requires a lot of code modification.

• It cannot ensure that instances are from the same database.

• It cannot create instances of different classes.

What is a suggested solution to mitigate the limitation of the factory method?

• Avoiding the use of any design patterns.

• Creating multiple factory classes for each database type.

• Hardcoding the database type in the application.

• Using a fixed database name variable throughout the application.

What is the purpose of the abstract factory design pattern?

• To ensure that instances are always from the same database.

• To create instances of classes without any factory methods.

• To eliminate the need for any factory classes.

• To allow mixing of classes from different databases.

How does the abstract factory pattern enforce consistency in database instances?

• By removing the need for factory methods.

• By allowing multiple factories to be used simultaneously.

• By using macros to define database types.

• By using a single factory instance to create all database objects.

What is the role of a common factory in the abstract factory pattern?

• To allow inheritance for specific database factories.

• To eliminate the need for specific database factories.

• To provide a single point of failure.

• To create instances of unrelated classes.