Book Image

C++ Reactive Programming

By : Praseed Pai, Peter Abraham
Book Image

C++ Reactive Programming

By: Praseed Pai, Peter Abraham

Overview of this book

Reactive programming is an effective way to build highly responsive applications with an easy-to-maintain code base. This book covers the essential functional reactive concepts that will help you build highly concurrent, event-driven, and asynchronous applications in a simpler and less error-prone way. C++ Reactive Programming begins with a discussion on how event processing was undertaken by different programming systems earlier. After a brisk introduction to modern C++ (C++17), you’ll be taken through language-level concurrency and the lock-free programming model to set the stage for our foray into the Functional Programming model. Following this, you’ll be introduced to RxCpp and its programming model. You’ll be able to gain deep insights into the RxCpp library, which facilitates reactive programming. You’ll learn how to deal with reactive programming using Qt/C++ (for the desktop) and C++ microservices for the Web. By the end of the book, you will be well versed with advanced reactive programming concepts in modern C++ (C++17).
Table of Contents (20 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Philosophy of Rx operators


If you take any reactive program, we see a chain of operators stacked between the Observable and the Observer. The developers use a fluent interface to chain operators. In RxCpp, one can use a dot (.) or pipe (|) to perform the operator chaining. From a software interface point of view, every operator takes an Observable and returns an Observable of the same kind or a different kind.

 

 

The general usage of an RxCpp Observable/Observer interaction (given as pseudo-code) is as follows:

Observable().     // Source Observable 
          Op1().     // First operator 
          Op2().     // Second operator 
                     ..                         
                     .. 
          Opn().subscribe( on_datahandler, 
                            on_errorhandler, 
                            on_completehandler); 

Even though we are using fluent interfaces when it comes to operator chaining, we are effectively composing functions together. To compose functions together...