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

Hello World of concurrency (using std::thread)


Now, let's get started with our first program using the std::thread library. You are expected to have C++ 11 or later to compile the programs we are going to discuss in this chapter. Let's take a simple, classic Hello World example as a reference before going into a multi-threaded Hello World:

//---- Thanks to Dennis Ritchie and Brian Kernighan, this is a norm for all languages
#include <iostream> 
int main() 
{ 
   std::cout << "Hello World\n"; 
} 

This program simply writes Hello World into the standard output stream (mainly the console). Now, let's see another example that does the same stuff, but using a background thread (often called a worker thread instead):

#include <iostream> 
#include <thread> 
#include <string> 
//---- The following function will be invoked by the thread library 
void thread_proc(std::string msg) 
{ 
   std::cout << "ThreadProc msg:" << msg; 
}  
int main() 
{ 
   // creates...