Book Image

Modern C++ Programming Cookbook

By : Marius Bancila
Book Image

Modern C++ Programming Cookbook

By: Marius Bancila

Overview of this book

C++ is one of the most widely used programming languages. Fast, efficient, and flexible, it is used to solve many problems. The latest versions of C++ have seen programmers change the way they code, giving up on the old-fashioned C-style programming and adopting modern C++ instead. Beginning with the modern language features, each recipe addresses a specific problem, with a discussion that explains the solution and offers insight into how it works. You will learn major concepts about the core programming language as well as common tasks faced while building a wide variety of software. You will learn about concepts such as concurrency, performance, meta-programming, lambda expressions, regular expressions, testing, and many more in the form of recipes. These recipes will ensure you can make your applications robust and fast. By the end of the book, you will understand the newer aspects of C++11/14/17 and will be able to overcome tasks that are time-consuming or would break your stride while developing.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Performing correct type casts


It is often the case that data has to be converted from one type to 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 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 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 to another pointer type, such as from a base class to a...