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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

Learning about the ordering of templates with constraints

When a compiler encounters function calls or class template instantiations, it needs to figure out what overload (for a function) or specialization (for a class) is the best match. A function may be overloaded with different type constraints. Class templates can also be specialized with different type constraints. In order to decide which is the best match, the compiler needs to figure out which one is the most constrained and, at the same time, evaluates to true after substituting all the template parameters. In order to figure this out, it performs the constraints normalization. This is the process of transforming the constraint expression into conjunctions and disjunctions of atomic constraints, as described at the end of the previous section.

An atomic constraint A is said to subsume another atomic constraint B if A implies B. A constraint declaration D1 whose constraints subsume the constraints of another declaration...

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