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Software engineering researchers and practitioners noticed that parts of software projects could often be solved using approaches that were discovered earlier to solve similar problems. This led to the documentation of software design and architectural patterns, which are known solution approaches to a class of problems. 

This course starts by putting software patterns into perspective by answering the question, “What is a software pattern, and how is it different from an algorithm?” You will then learn about the two classes of patterns—software design and architecture patterns. Next, you’ll learn common C++ idioms. Finally, you will learn about software patterns for concurrency. 

By the end of the course, you will have useful and practical tools to improve the quality of your code and productivity. You’ll also be able to analyze a given part of your software project, pick the right pattern for the job, and apply it.

Master Software Design Patterns and Architecture in C++

## Problem statement 

Modify the example code in the previous lesson and add the following functionalities: 

* Add a new leap class called a `Circle`.
* Make some instances of the `Circle` and add them to the `grafik1` or `grafik2` objects.
* The leaf objects of the `Circle` class should print `Circle.`

## Coding challenge

# Problem statement 

Modify the example code in the previous lesson and add the following functionalities: 

* Add a new leap class called a `Circle`.
* Make some instances of the `Circle` and add them to the `grafik1` or `grafik2` objects.
* The leaf objects of the `Circle` class should print `Circle.`

# Coding challenge

Test your understanding of the composite design pattern and add a leap node.

Introduction

Introduction to Design Patterns

Deep Dive into Design Patterns

More Design Patterns

Idioms

Architectural Patterns

Patterns for Concurrency

Conclusion

Exercise: Composite Design Pattern

Problem statement

Coding challenge