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

Performing correct type casts

It is often the case that data has to be converted from one type into another type. Some conversions are necessary at compile time (such as double to int); others are necessary at runtime (such as upcasting and downcasting pointers to the classes in a hierarchy). The language supports compatibility with the C casting style in either the (type)expression or type(expression) form. However, this type of casting breaks the type safety of C++.

Therefore, the language also provides several conversions: static_cast, dynamic_cast, const_cast, and reinterpret_cast. They are used to better indicate intent and write safer code. In this recipe, we'll look at how these casts can be used.

How to do it...

Use the following casts to perform type conversions:

  • Use static_cast to perform type casting of non-polymorphic types, including casting of integers to enumerations, from floating point to integral values, or from a pointer type...