Book Image

Modern C++ Programming Cookbook - Second Edition

By : Marius Bancila
5 (1)
Book Image

Modern C++ Programming Cookbook - Second Edition

5 (1)
By: Marius Bancila

Overview of this book

C++ has come a long way to be one of the most widely used general-purpose languages that is fast, efficient, and high-performance at its core. The updated second edition of Modern C++ Programming Cookbook addresses the latest features of C++20, such as modules, concepts, coroutines, and the many additions to the standard library, including ranges and text formatting. The book is organized in the form of practical recipes covering a wide range of problems faced by modern developers. The book also delves into the details of all the core concepts in modern C++ programming, such as functions and classes, iterators and algorithms, streams and the file system, threading and concurrency, smart pointers and move semantics, and many others. It goes into the performance aspects of programming in depth, teaching developers how to write fast and lean code with the help of best practices. Furthermore, the book explores useful patterns and delves into the implementation of many idioms, including pimpl, named parameter, and attorney-client, teaching techniques such as avoiding repetition with the factory pattern. There is also a chapter dedicated to unit testing, where you are introduced to three of the most widely used libraries for C++: Boost.Test, Google Test, and Catch2. By the end of the book, you will be able to effectively leverage the features and techniques of C++11/14/17/20 programming to enhance the performance, scalability, and efficiency of your applications.
Table of Contents (16 chapters)
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Executing functions asynchronously

Threads enable us to run multiple functions at the same time; this helps us take advantage of the hardware facilities in multiprocessor or multicore systems. However, threads require explicit, lower-level operations. An alternative to threads is tasks, which are units of work that run in a particular thread. The C++ standard does not provide a complete task library, but it enables developers to execute functions asynchronously on different threads and communicate results back through a promise-future channel, as seen in the previous recipe. In this recipe, we will see how to do this using std::async() and std::future.

Getting ready

For the examples in this recipe, we will use the following functions:

void do_something()
  // simulate long running operation
    using namespace std::chrono_literals;
  std::lock_guard<std::mutex> lock(g_mutex);
  std::cout << "operation 1 done...