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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Selecting branches at compile time with constexpr if

In the previous recipes, we saw how we can impose restrictions on types and functions using static_assert and std::enable_if and how these two are different. Template metaprogramming can become complicated and cluttered when we use SFINAE and std::enable_if to define function overloads or when we write variadic function templates. A new feature of C++17 is intended to simplify such code; it is called constexpr if, and it defines an if statement with a condition that is evaluated at compile time, resulting in the compiler selecting the body of a branch or another in the translation unit. Typical usage of constexpr if is for simplification of variadic templates and std::enable_if-based code.

Getting ready

In this recipe, we will refer to and simplify the code written in previous recipes. Before continuing with this recipe, you should take a moment to go back and review the code we have written in the previous recipes...