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Template Metaprogramming with C++

You're reading from   Template Metaprogramming with C++ Learn everything about C++ templates and unlock the power of template metaprogramming

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Product type Paperback
Published in Aug 2022
Publisher Packt
ISBN-13 9781803243450
Length 480 pages
Edition 1st Edition
Languages
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Author (1):
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Marius Bancila Marius Bancila
Author Profile Icon Marius Bancila
Marius Bancila
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Table of Contents (16) Chapters Close

Preface 1. Part 1: Core Template Concepts
2. Chapter 1: An Introduction to Templates FREE CHAPTER 3. Chapter 2: Template Fundamentals 4. Chapter 3: Variadic Templates 5. Part 2: Advanced Template Features
6. Chapter 4: Advanced Template Concepts 7. Chapter 5: Type Traits and Conditional Compilation 8. Chapter 6: Concepts and Constraints 9. Part 3: Applied Templates
10. Chapter 7: Patterns and Idioms 11. Chapter 8: Ranges and Algorithms 12. Chapter 9: The Ranges Library 13. Assignment Answers 14. Other Books You May Enjoy Appendix: Closing Notes

Defining class templates

Class templates are declared in a very similar manner, with the template keyword and the template parameter list preceding the class declaration. We saw the first example in the introductory chapter. The next snippet shows a class template called wrapper. It has a single template parameter, a type called T, that is used as the type for data members, parameters, and function return types:

template <typename T>
class wrapper
{
public:
   wrapper(T const v): value(v)
   { }
   T const& get() const { return value; }
private:
   T value;
};

As long as the class template is not used anywhere in your source code, the compiler will not generate code from it. For that to happen, the class template must be instantiated and all its parameters properly matched to arguments either explicitly, by the user, or implicitly, by the compiler. Examples for instantiating this class template are shown next...

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