Book Image

Template Metaprogramming with C++

By : Marius Bancila
5 (1)
Book Image

Template Metaprogramming with C++

5 (1)
By: Marius Bancila

Overview of this book

Learn how the metaprogramming technique enables you to create data structures and functions that allow computation to happen at compile time. With this book, you'll realize how templates help you avoid writing duplicate code and are key to creating generic libraries, such as the standard library or Boost, that can be used in a multitude of programs. The introductory chapters of this book will give you insights into the fundamentals of templates and metaprogramming. You'll then move on to practice writing complex templates and exploring advanced concepts such as template recursion, template argument deduction, forwarding references, type traits, and conditional compilation. Along the way, you'll learn how to write variadic templates and how to provide requirements to the template arguments with C++20 constraints and concepts. Finally, you'll apply your knowledge of C++ metaprogramming templates to implement various metaprogramming patterns and techniques. By the end of this book, you'll have learned how to write effective templates and implement metaprogramming in your everyday programming journey.
Table of Contents (16 chapters)
Part 1: Core Template Concepts
Part 2: Advanced Template Features
Part 3: Applied Templates
Appendix: Closing Notes

Seeing real-world examples of using type traits

In the previous section of the chapter, we have explored the various type traits that the standard library provides. It is difficult and unnecessary to find examples for each and every type trait. However, it is worth showcasing some examples where multiple type traits can be used for solving a problem. We will do this next.

Implementing a copy algorithm

The first example problem we will take a look at is a possible implementation for the std::copy standard algorithm (from the <algorithm> header). Keep in mind that what we will see next is not the actual implementation but a possible one that helps us learn more about the use of type traits. The signature of this algorithm is as follows:

template <typename InputIt, typename OutputIt>
constexpr OutputIt copy(InputIt first, InputIt last,