C++ Design Patterns: Behavioral

Introduction

• Behavioral patterns improve software design
• What you should know

• What are design patterns?

• The Chain of Responsibility pattern
• Implementing the Chain of Responsibility pattern
• Create Chain of Responsibility handlers
• The Command pattern
• Implementing the Command pattern
• Increasing code reuse with commands
• The Mediator pattern
• Implementing the Mediator pattern
• Using the Mediator from inside other classes
• The Observer pattern
• Creating publishers
• Creating subscribers
• Project: Create a group-chat program
• Challenge: Apply the Command pattern
• Solution: Apply the Command pattern

• The Interpreter pattern
• Implementing the Interpreter pattern
• Applying the Interpreter pattern
• The State pattern
• Implementing the State pattern
• Applying the State pattern
• The Strategy pattern
• Creating strategies
• Rewriting classes to use strategies
• The Template Method pattern
• Creating template methods
• Modifying templates using subclasses
• The Visitor pattern
• Implementing visitors
• Allowing classes to accept visitors
• Project: Create a greeting-card generator program
• Challenge: Modifying the card generator
• Solution: Modifying the card generator

• The Iterator pattern
• Implementing the Iterator pattern
• Using iterators
• The Memento pattern
• Creating a Memento class
• Using Memento classes
• The Null Object pattern
• Creating Null Object classes
• Setting null objects as the default
• Project: Create an instant replay program
• Challenge: Apply the Null Object pattern
• Solution: Apply the Null Object pattern

• Next steps