Gain insights into software design patterns in C, explore their implementation, discover underlying principles, and learn to build a vocabulary for better communication and coding practices.

c.tar.gz

main+customer.c

main+customer.c-copy

watches

customers

observer

Reactor

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Software design patterns are a valuable tool in any software developer's skill set. However, most design patterns are described in the context of an object-oriented programming language such as C++ or Java. The C language is sadly absent in the pattern literature. This course is here to change that by demonstrating that it is possible to use patterns in C programs and how it adds benefits to C programmers. You will learn why design patterns are more of a communication tool than technical solutions, and how patterns let you build and share a common vocabulary that simplifies communication.

The course presents a number of patterns and explains how to implement them in C. Each pattern is introduced via the problem it solves and the domains where the pattern can be used. We also discuss the underlying design principles as well as the trade-offs when applying the pattern. Finally, the course covers a set of coding idioms that will guide you when applying design patterns in C.

Software Design Patterns in C

Over the years, the **State pattern** has been **refactor** several times. The
main problem with the State pattern is its name. 



![](/api/collection/10370001/5041597622779904/page/4898686067277824/image/6309754290307072)

The problems with the State pattern are:
* The name can cause confusion if used with imperative programming.
* It’s quite a complex pattern and, in most cases, simpler alternatives will do.
* In simple cases, explicit conditional logic works well and State isn't needed.

As far as the name of the pattern is concerned, ***Design Patterns*** suggests a better name: **Objects For State**. The alternative name is the better fit because it expresses both the intent and resulting structure in a more obvious way.

In this lesson, we will briefly explain the State pattern.

Introduction to Pattern in C

The First-Class ADT Pattern

The State Pattern

The Strategy Pattern

The Observer Pattern

The Reactor Pattern

Idiomatic Expressions

Conclusion

Reflections on State Pattern

Criticism