Behavioral Design Patterns in C++ - Introduction-Mediator

The video tutorial explains the mediator design pattern, which facilitates interaction between objects by using a central mediator object. This pattern reduces coupling and simplifies system modification. A real-life example of an airport is used to illustrate the concept. The tutorial covers the intent of the pattern, the role of colleagues and concrete mediators, and different implementation strategies, including the use of command and observer patterns.

What is the primary purpose of the Mediator design pattern?

• To increase the number of interconnections between objects

• To allow objects to communicate directly with each other

• To make objects more dependent on each other

• To reduce unwanted interconnections by using a central mediator

In the airport example, who do pilots communicate with to make decisions?

• Other pilots

• The airport manager

• The air traffic controller

• The ground staff

What does the Mediator pattern promote by keeping objects from referring to each other explicitly?

• Loose coupling

• Direct communication

• Tight coupling

• Increased complexity

What is a key benefit of using a mediator in a system with multiple objects?

• It increases the number of references each object has

• It requires each object to know about all others

• It makes the system more monolithic

• It allows for independent variation of interactions

What is the role of a concrete mediator in the Mediator pattern?

• To directly communicate with all objects

• To contain the logic of interaction between colleagues

• To replace the need for a central object

• To increase the coupling between objects

Which pattern can be used to help the mediator handle events from colleagues?

• Command pattern

• Factory pattern

• Singleton pattern

• Decorator pattern

What is a potential downside of using hard-coded logic in the mediator?

• It makes the mediator unnecessary

• It reduces the number of objects

• It leads to tight coupling

• It simplifies the system