Structural Design Patterns in Modern C++ - Basic Implementation

The video tutorial provides a basic implementation of the Flyweight design pattern. It covers the creation of Flyweight, Concrete Flyweight, and Unshared Concrete Flyweight classes, along with a Flyweight Factory. The tutorial explains how intrinsic and extrinsic states are managed and shared among flyweights. It also demonstrates the use of a factory to create and manage flyweight instances, promoting loose coupling. The video concludes with a class diagram and a brief summary of the pattern's implementation.

What is the primary purpose of the Flyweight design pattern?

• To simplify the interface of a class

• To ensure each object has a unique state

• To reduce memory usage by sharing common parts of objects

• To create a new class for each object

What is the role of the intrinsic state in the Flyweight pattern?

• It is used to identify each flyweight

• It is shared and immutable across instances

• It is mutable and changes frequently

• It is unique to each instance

How does the Unshared Concrete Flyweight differ from the Concrete Flyweight?

• It shares its state with other flyweights

• It is created by the client directly

• It has its own state and is not shared

• It does not operate on extrinsic state

What is the main advantage of using a Flyweight Factory?

• It allows direct interaction with flyweights

• It enforces a strict coupling between classes

• It promotes loose coupling by managing flyweight instances

• It eliminates the need for extrinsic state

What is the purpose of using an associative container in the Flyweight Factory?

• To eliminate the need for intrinsic state

• To create new flyweight instances

• To store and manage flyweight instances

• To ensure each flyweight is unique

How does the Flyweight pattern handle extrinsic state?

• It is computed and passed to flyweights as needed

• It is stored within each flyweight

• It is shared among all flyweights

• It is ignored by the flyweights

What happens when a flyweight instance with a specified key does not exist in the factory?

• The factory returns null

• A new instance is created and added to the pool

• The factory throws an error

• The client is asked to create the instance