C++ Move Semantics - The Complete Guide
This book is 100% complete
Completed on 2020-09-28
About the Book
Move semantics, introduced with C++11, has become a hallmark of modern C++ programming. However, it also complicates the language in many ways. After several years of support of move semantics experienced programmers struggle with all the details of move semantics. Even for trivial classes, style guides give conflicting or inappropriate advice on how to benefit from move semantics. Time to explain all aspects of C++ move semantics in detail.
This book teaches C++ move semantics. Starting from the basic principles, it motivates and explains all the corner cases of move semantics so that as a programmer, you can use move semantics correctly. The book is valuable for those who are just starting to learn about move semantics and is essential for those who are using it already.
You will learn:
- The motivation for and terminology of move semantics
- How and why you benefit implicitly from move semantics
- How to benefit explicitly from move semantics
- All the traps involved in move semantics and how to deal with them
- All the consequences of move semantics for your programming style
As usual for books by Nicolai Josuttis, the focus lies on the application of the described features in practice. Compelling examples and useful background information help to understand and improve code, from trivial classes up to generic foundation libraries and frameworks.
"Sometimes I think I have a better grasp on entanglement & quantum teleportation than I do in some weird C++ move semantics. To paraphrase Feynman: If you think you understand C++ move semantics, you don't understand C++ move semantics. Read this book." Victor Ciura
"This is the book I’ve needed for a long time." Rob Bernstein
"I thought I understood move semantics but I didn't really! I learnt a lot in your book." Jonathan Boccara
Buy early, pay less, free updates
Note that this book is published step-by-step. It started with 110 pages first published in January 2020. Since then, the content grows with new chapters, examples, and caveats about the features of move semantics and I integrate all feedback I get for the pages already published.
Currently, the book is feature complete (all language features are described).
Only the use of move semantics in the C++ standard library and the final proof reading (yes, I am not a native English writer) is missing.
See www.cppmove.com for a detailed list of covered topics.
As written, once you bought it you will get all updates for free.
There is not errata yet, but I welcome all feedback to improve the current version.
Look at http://www.cppmove.com/feedback.html.
PDF versus Other Formats
I write the book in LaTeX and generate PDF from it (the way I wrote my other books). The other formats (epub, mobi, and online reading) come from the leanpub markdown interface, for which I generate the necessary input from LaTeX by script.
Thus, the PDF layout has a better quality than the other formats. For example, the syntax highlighting rules for the formats other than PDF have to get fixed as soon as possible and the index is missing yet. Leanpub and me are working on corresponding improvements.
I hope you enjoy and benefit.
- An Experiment
- Versions of This Book
About This Book
- What You Should Know Before Reading This Book
- Overall Structure of the Book
- How to Read This Book
- The Way I Implement
- The C++ Standards
- Example Code and Additional Information
Basic Features of Move Semantics
The Power of Move Semantics
- Motivation for Move Semantics
- Implementing Move Semantics
- Copying as a Fallback
Move Semantics for
Core Features of Move Semantics
- Rvalue References
- Moved-From Objects
- Overloading by Different References
- Passing by Value
Move Semantics in Classes
- Move Semantics in Ordinary Classes
- Implementing Special Copy/Move Member Functions
- Rules for Special Member Functions
- The Rule of Five or Three
How to Benefit From Move Semantics
- Avoid Objects with Names
- Initialize Members with Move Semantics
- Move Semantics in Class Hierarchies
Overloading on Reference Qualifiers
- Return Type of Getters
- Overloading on Qualifiers
- When to Use Reference Qualifiers
- Required and Guaranteed States of Moved-From Objects
- Destructible and Assignable
- Dealing with Broken Invariants
Move Semantics and
Move Constructors with and without
noexceptDeclarations in Class Hierarchies
When and Where to Use
- Move Constructors with and without
- Value Categories
- Special Rules for Value Categories
- Impact of Value Categories When Binding References
- When Lvalues become Rvalues
- When Rvalues become Lvalues
Checking Value Categories with
- The Power of Move Semantics
Move Semantics in Generic Code
- Motivation for Perfect Forwarding
- Implementing Perfect Forwarding
- Rvalue References versus Universal References
- Overload Resolution with Universal References
- Perfect Forwarding in Lambdas
Tricky Details of Perfect Forwarding
- Universal References as Non-Forwarding References
- Universal or Ordinary Rvalue Reference?
- How the Standard Specifies Perfect Forwarding
- Nasty Details of Perfect Forwarding
Perfect Passing with
- Default Perfect Passing
Universal References with
auto&&as Non-Forwarding Reference
- Perfect Forwarding in Lambdas
auto&&in C++20 Function Declarations
Perfect Returning with
- Perfect Returning
- Perfect Forwarding
Move Semantics in the C++ Standard Library
- Declaring and Using Move-Only Types
Moving Algorithms and Iterators
- Moving Algorithms
- Removing Algorithms
- Move Iterators
Move Semantics in Types of the C++ Standard Library
- Move Semantics for Strings
- Move Semantics for Containers
- Move Semantics for Vocabulary Types
- Move Semantics for Smart Pointers
- Move Semantics for IOStreams
- Move Semantics for Multithreading
- Move-Only Types
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