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)
13
Bibliography
14
Other Books You May Enjoy
15
Index

Using the bit manipulation utilities

In the previous recipes, we have seen how to use std::bitset and std::vector<bool> to work with fixed and variable sequences of bits. There are, however, situations when we need to manipulate or process individual or multiple bits of an unsigned integral value. This includes operations such as counting or rotating bits. The C++20 standard provides a set of utility functions for bit manipulation as part of the numeric library. In this recipe, we will learn what they are and how to use these utilities.

Getting ready

The function templates discussed in this recipe are all available in the std namespace in the new C++20 header <bit>.

How to do it…

Use the following function templates to manipulate bits of unsigned integral types:

  • If you need to perform a circular shift, use std::rotl<T>() for left rotation and std::rotr<T>() for right rotation:
    unsigned char n = 0b00111100;
    auto vl1...