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C++ Reactive Programming
C++ Reactive Programming

C++ Reactive Programming: Design concurrent and asynchronous applications using the RxCpp library and Modern C++17

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Profile Icon Praseed Pai Profile Icon Abraham
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Full star icon Full star icon Full star icon Empty star icon Empty star icon 3 (8 Ratings)
Paperback Jun 2018 348 pages 1st Edition
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Arrow left icon
Profile Icon Praseed Pai Profile Icon Abraham
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€18.99 per month
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3 (8 Ratings)
Paperback Jun 2018 348 pages 1st Edition
eBook
€20.98 €29.99
Paperback
€36.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€20.98 €29.99
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€36.99
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Renews at €18.99p/m

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C++ Reactive Programming

A Tour of Modern C++ and its Key Idioms

The classic C++ programming language was standardized in 1998 and it was followed by a small revision (mostly corrections) in 2003. To support advanced abstractions, developers relied on the Boost (http://www.boost.org) library and other public domain libraries. Thanks to the next wave of standardization, the language (from C++ 11 onward) was enhanced, and now developers can encode most widely used abstractions (supported by other languages) without relying on external libraries. Even threads and file-system interfaces, which came squarely under the aegis of libraries, are now part of the standard language. Modern C++ (which stands for C++ versions 11/14/17 ) contains superb additions to the language and its libraries, that make C++ the de-facto choice for writing industrial strength production software. The features covered in this chapter...

The key concerns of the C++ programming language

As far as developers are concerned, the three key concerns that C++ programming language designers keep in mind were (and still are) as follows:

  • Zero Cost Abstraction - No performance penalty for higher level abstraction
  • Expressivity - A user defined type (UDT) or class should be as expressive as built-in types
  • Substitutability - A UDT can be substituted wherever built-in-types are expected (as in generic data structures and algorithms)

We will discuss these briefly.

Zero cost abstraction

The C++ programming language has always helped developers to write code that exploits the microprocessor (on which generated code runs) and also raise the level of abstraction when it matters...

Enhancements to C++ for writing better code

The programming language universe has changed a lot in the last decade and those changes should reflect in the  C++ programming language in its new avatar. Most of the innovations in Modern C++ involve handling advanced abstractions and the introduction of functional programming constructs to support language level concurrency. Most modern languages have got a garbage collector and a run-time manages these complexities. The C++ programming language does not have automatic garbage collection as part of the language standard. The C++ programming languages with its implicit guarantee of Zero cost abstraction (you do not pay for what you do not use) and maximum run-time performance, has to resort to a lot of compile-time tricks and meta programming techniques to achieve the abstraction level supported by a language such as C#, Java...

Composing functions together with the pipe operator

The Unix operating system's command line shell allows the standard output of one function to be piped into the another to form a filter chain. Later, this feature became part of every command line shell offered as part of most operating systems. While writing functional style code, when we combine methods through functional composition, the code becomes hard to read because of deep nesting. Now, with Modern C++ we can overload the pipe (|) operator to allow chaining several functions together, like we do commands in a Unix shell or Windows PowerShell console. That is why someone re-christened the LISP language as Lots of Irritating and Silly Parentheses. The RxCpp library uses the | operator extensively to compose functions together. The following code helps us understand how one can create pipeable functions. We will...

Miscellaneous features

So far, we have covered the most important semantic changes to the language beginning with the C++ 11 standard. The purpose of this chapter is to highlight key changes that might be useful in writing idiomatic Modern C++ programs. The C++ 17 standard added some more stuff into the language. We will be highlighting a few more features of the language to wrap up this discussion.

Fold expressions

The C++ 17 standard added support for fold expressions to ease the generation of variadic functions. The Compiler does pattern matching and generates the code by inferring the intent of the programmer. The following code snippet demonstrates the idea:

//---------------- Folds.cpp
//--------------- Requires...

Range-based for loops and observables

In this section, we will implement range-based for loops on a custom type written by us to help you understand how all the things mentioned earlier in this chapter can be put together to write programs that support modern idioms. We will  implement a class that returns a series of numbers within a bound and will implement infrastructure support for the iteration of the values based on range-based for loops. First, we write the  "Iterable/Iterator" (aka "Enumerable/Enumerable") version by leveraging the range-based for loops.  After some tweaks, the implementation will be transformed to Observable/Observer (the key interface of Reactive Programming) patterns: The implementation of Observable/Observer pattern here is just for elucidation purpose and  should not be considered as an Industrial strength implementation...

Summary

In this chapter, we learned about programming language features that a C++ programmer should be comfortable with while writing Reactive programs, or for that matter any kind of programs. We talked about type inference, Variadic templates, rvalue references and move semantics, Lambda functions, elementary Functional programming, pipeable operators, and implementation of Iterators and observers. In the next chapter, we will  learn about concurrent programming support provided by the C++ programming language.

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Key benefits

  • Efficiently exploit concurrency and parallelism in your programs
  • Use the Functional Reactive programming model to structure programs
  • Understand reactive GUI programming to make your own applications using Qt

Description

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).

Who is this book for?

If you’re a C++ developer interested in using reactive programming to build asynchronous and concurrent applications, you’ll find this book extremely useful. This book doesn’t assume any previous knowledge of reactive programming.

What you will learn

  • Understand language-level concurrency in C++
  • Explore advanced C++ programming for the FRP
  • Uncover the RxCpp library and its programming model
  • Mix the FP and OOP constructs in C++ 17 to write well-structured programs
  • Master reactive microservices in C++
  • Create custom operators for RxCpp
  • Learn advanced stream processing and error handling

Product Details

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Publication date : Jun 29, 2018
Length: 348 pages
Edition : 1st
Language : English
ISBN-13 : 9781788629775
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Publication date : Jun 29, 2018
Length: 348 pages
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Language : English
ISBN-13 : 9781788629775
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Table of Contents

14 Chapters
Reactive Programming Model – Overview and History Chevron down icon Chevron up icon
A Tour of Modern C++ and its Key Idioms Chevron down icon Chevron up icon
Language-Level Concurrency and Parallelism in C++ Chevron down icon Chevron up icon
Asynchronous and Lock-Free Programming in C++ Chevron down icon Chevron up icon
Introduction to Observables Chevron down icon Chevron up icon
Introduction to Event Stream Programming Using C++ Chevron down icon Chevron up icon
Introduction to Data Flow Computation and the RxCpp Library Chevron down icon Chevron up icon
RxCpp – the Key Elements Chevron down icon Chevron up icon
Reactive GUI Programming Using Qt/C++ Chevron down icon Chevron up icon
Creating Custom Operators in RxCpp Chevron down icon Chevron up icon
Design Patterns and Idioms for C++ Rx Programming Chevron down icon Chevron up icon
Reactive Microservices Using C++ Chevron down icon Chevron up icon
Advanced Streams and Handling Errors Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
(8 Ratings)
5 star 25%
4 star 0%
3 star 37.5%
2 star 25%
1 star 12.5%
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SXX Sep 28, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is an interesting book introducing C++ reactive programming and RxCpp. It starts with bibliographical references to MFC, Qt, and Win32 event-handling mechanisms. I guess if you had not any previous exposure to MFC, Qt, or Win32, you may find this part of the book quite irrelevant. But I found the first chapter quite interesting with the perspective and context the authors trying to set. Then the book continues to review related modern C++ features - again, some may find this redundant, but it includes quite some gems with the authors’ insightful comments and review here and there. The core chapters on Rx framework RxCpp is in the latter part of the book. Be patient, and read through the book, and you will be rewarded!
Amazon Verified review Amazon
Patrick Faith Oct 22, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Not sure what is up with the negative reviews but I find this an excellent book not just for reactive programming but generally on how one should approach more sophisticated C++. For example it goes real slow when and how to pass a object by reference to a thread, where the average person might not realize some of the subtleties in doing so. I also found the examples exceptionally well thought out.
Amazon Verified review Amazon
Dzu Nguyen May 26, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
The first half of the book is a good review of C++11, 14 features, as well as a few design patterns. I would say it is the better part of the book. However experts on C++11 won't find it useful.The second half of the book touches a shallow surface of reactive programming. The explanation on the reactive programming concept is very unclear, sometimes very brief. And It is even harder with all the typos in the text and in the code.However, there is still some valuable introduction to the subject that may be helpful to you. I read this book, didn't quite understand the concepts. Then I read "Functional Programming in C++" by Ivan Cukic. That book is great. I did not give up on this book though. I came back and reread this book. It became easier to understand and I find it more useful.
Amazon Verified review Amazon
Amazon Customer Apr 07, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Firstly, I have never seen so many typos in a published book. There are typos on almost every single page. If you're willing to accept that, the book does a reasonable job of explaining RxCPP and the architecture behind it. It is not a straight forward subject and online examples are few and far between.
Amazon Verified review Amazon
Nick Yates Apr 06, 2019
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Book was worth the money for the examples alone. On the downside the reader is left to fill in the dots too many times. Book referenced rxjava rather than explain some fundamental concepts itself. The examples gave the impression that they had been hurriedly produced.
Amazon Verified review Amazon
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