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

Reactor-copy

observer-copy

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

The C language itself does not provide much support for handling its built-in arrays. For example, when
passing a certain array to a function, the array decays into a pointer to its first element. Without any
specific convention and given only the pointer, it simply isn’t possible to tell the size of the array. Most
APIs leave this book-keeping task to the programmer. One example is the ```poll()``` function in the **POSIX
API**, which is used as an event demultiplexer scanning handles for events. These handles, which refer to
platform-specific resources like sockets, are stored in an array and passed to ```poll()```. The array is followed
by an argument specifying the number of elements.

In this lesson, we will briefly explain the Array Size by Division.

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

Array Size by Division

Problem Context