C++ Lambda Story
C++ Lambda Story
Everything you need to know about Lambda Expressions in Modern C++!
About the Book
This book guides you through the evolution of C++ Lambda Expressions so that you can learn it step by step. We'll start with C++03 and a motivation to have "ad-hoc" functors, and then we'll move into the latest C++ standards:
- C++11 - early days of the feature. You'll learn about all the essential aspects of lambdas and several tricks you might apply. This is the longest chapter as we need to cover a lot of topics.
- C++14 - updates. See how to use generic lambdas and captures with an initialiser.
- C++17 - more improvements, especially by handling `this` pointer and allowing `constexpr`. You'll also learn about the overloaded pattern and how to derive from lambda.
- C++20 - in this section you'll see all of the new features adopted for C++20 like template lambdas and how to use them with concepts and constexpr algorithms.
Additionally, throughout the chapters, you'll learn about the following techniques:
- Immediately Invoked Functional Expressions (IIFE)
- How to instrument a default functor to gather extra information
- Replacing std::bind1st, std::bind2nd and removed functional stuff
- The Overloaded Pattern and how to inherit from a lambda
- Passing C++ captureless lambda as a function pointer to C API
- LIFTING with lambdas
- Storing lambdas in a container
- Variadic templates and arguments packs
- Lambdas and asynchronous execution
- and many more
While the book is 100% ready, I might release some "hot-fixes" smaller releases. All existing readers get new updates for free.
The book is inspired by two articles that appeared at bfilipek.com:
The articles also are based on a live coding presentation given by C++ Expert Tomasz Kamiński at our local Cracow C++ User Group.
Readers Feedback & Reviews
Below, you can find the GoodReads page for the book with the readers' feedback:
And a review at Adam Sawicki Blog:
FAQ
I'm a beginner in C++? Is that book for me?
The book assumes that you have a basic knowledge of C++. I suggest taking some elementary course first.
I'm an expert, and I know everything about C++? Is that book for me?
Yeah... you know all about C++? Is this possible? :)
Anyway, in your case, the book will give you a good refresher and even will show you some new tricks.
I'm not a beginner nor an expert...?
Perfect! So the book will show you lots of examples that will expand your knowledge and also remind you things that you may already know.
Additionally, throughout the book, you'll see other techniques and features related to modern C++ like, `constexpr`, exceptions, fold expressions, `std::thread`, perfect forwarding using callable objects and many more.
Is this a historical book with lots of boring descriptions?
The flow of the book focuses on the background behind lambda expression and its evolution. But it's meant to teach you practical things. You'll learn the lambdas step by step, understanding new capabilities that lambdas got with each C++ revision.
Will I get free updates?
Yes! While the book is 100% ready, I might add some more updates in the future, mainly bug fixes.
That's why it's best to by the book as early as possible; for example, the earliest version of the book was completely free.
The content looks like copied directly from the blog, so what's the point to buy it?
The very early version of the book was adapted directly from the blog... but then most of the content was rewritten and heavily updated. Now, you get at least 4x of what's available on the blog, not to mention the better quality and a nice looking pdf/ebook (there's no need to click and jump between separate blog articles).
On the Internet there's lot's of free content about lambdas, so why buy the book?
Sure! Even on my blog, you can find lots of articles about lambda expression. The C++ draft is also free, so you can read the specification on your own. Or have an additional explanation from great cppreference pages.
But the book will save you lots of your precious time looking for those quality content, extra examples, extended descriptions. What's more, by having a nice learning flow, you can understand this powerful C++ feature much faster at a super low price.
Is there a refund option?
Yes! if you buy the Book through Leanpub, then you have a 45-day guarantee. (Not applicable with Kindle direct Publishing though).
You can also download a preview with almost 60 pages.
Did I miss something?
If you have more questions, then please ask directly and write at bartlomiej DOT filipek AT bfilipek.com.
Bundles that include this book
Reader Testimonials
Kobi
C++ Software Developer, San Diego
Just like in his previous book and his blog, Bartłomiej explains very well the details of lambda basics, the usage of lambda in your C++ code and goes all the way to the expert domain of this topic. Great read and very comprehensive (e)book to keep on your desk.
Jonathan Boccara
(fluentcpp.com)
This is a great piece of work, stuffed with details and practical examples, and very easy to read. A must-read to know how to make the most of lambdas in your C++ code.
Table of Contents
-
About the Book
- Roots Of The Book
- Who This Book is For
- How To Read This Book
- Reader Feedback & Errata
- Example Code
- Code License
-
Formatting And Special Sections
- Syntax Highlighting Limitations
- Special Sections
- Online Compilers
- About the Author
- Acknowledgements
- Revision History
-
1. Lambdas in C++98/03
-
Callable Objects in C++98/03
- What is a “Functor”?
- Issues with Function Object Class Types
- Composing With Functional Helpers
- Motivation for a New Feature
-
Callable Objects in C++98/03
-
2. Lambdas in C++11
-
The Syntax of Lambda Expression
- A Few Examples of Lambda Expressions
-
Core Definitions
- Compiler Expansion
-
The Type of a Lambda Expression
- Constructors and Copying
-
The Call Operator
- Overloading
- Attributes
- Other Modifiers
-
Captures
- Generated Code
- Capture All or Explicit?
-
The
mutable
Keyword - Invocation Counter - An Example of Captured Variables
- Capturing Global Variables
- Capturing Statics
-
Capturing a Class Member And the
this
Pointer - Moveable-only Objects
- Preserving Const
- Capturing a Parameter Pack
-
Return Type
- Trailing Return Type Syntax
-
Conversion to a Function Pointer
- A Tricky Case
-
IIFE - Immediately Invoked Functional Expression
- One Note About the Readability
- Inheriting from a Lambda
- Storing Lambdas in a Container
- Summary
-
The Syntax of Lambda Expression
-
3. Lambdas in C++14
- Default Parameters for Lambdas
- Return Type Deduction
-
Captures With an Initialiser
- Limitations
- Improvements for Existing Issues
-
Generic Lambdas
- Variadic Generic Arguments
- Perfect Forwarding with Generic Lambdas
- Deducing the Correct Type
-
Replacing
std::bind1st
andstd::bind2nd
with Lambdas- Using Modern C++ Techniques
- Function Composition
- LIFTing with lambdas
-
Recursive Lambdas
-
With
std::function
- Internal Lambda and a Generic Parameter
- More Tricks
- Is a recursive lambda the best alternative?
-
With
- Summary
-
4. Lambdas in C++17
- Lambda Syntax Update
- Exception Specification in the Type System
-
constexpr
Lambda Expressions- Examples
- Capturing Variables
-
constexpr
Summary:
-
Capture of
*this
- Some Guides
- Updates To IIFE
- Extracting Functions with IIFE
- Updates to Variadic Generic Lambdas
-
Deriving from Multiple Lambdas
- Custom Template Argument Deduction Rules
- Extension to Aggregate Initialisation
-
Example with
std::variant
andstd::visit
-
Concurrent Execution Using Lambdas
-
Lambdas with
std::thread
-
Lambdas with
std::async
- Lambdas and Parallel Algorithms from C++17
- Lambdas And Async - Wrap Up
-
Lambdas with
- Summary
-
5. Lambdas in C++20
- Lambda Syntax Update
- A Quick Overview of the Changes
-
consteval
Lambdas - Capturing a Parameter Pack
- Template Lambdas
- Concepts and Lambdas
-
Changes to Stateless Lambdas
- Even more with unevaluated contexts
-
Lambdas and
constexpr
Algorithms - C++20 Updates to the Overloaded Pattern
- Summary
- Appendix A - List of Techniques
-
Appendix B - Six Advantages of C++ Lambda Expressions
- 1. Lambdas Make Code More Readable
-
2. Lambdas Can Compile 7x Faster than
std::bind
! - 3. Lambdas Improve Locality of the Code
- 4. Lambdas Allow Storing State Easily
- 5. Lambdas Allow Several Overloads in the Same Place
- 6. Lambdas Get Better with Each Revision of C++!
- References
- Index
- Notes
Authors have earned$10,095,386writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Top Books
C++20
Rainer GrimmC++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.
The book is almost daily updated. These incremental updates ease my interaction with the proofreaders.
A Guide to Artificial Intelligence in Healthcare
Dr. Bertalan MeskoCan we stay human in the age of A.I.? To go even further, can we grow in humanity, can we shape a more humane, more equitable and sustainable healthcare? This e-book aims to prepare healthcare and medical professionals for the era of human-machine collaboration. Read our guide to understanding, anticipating and controlling artificial intelligence.
Atomic Kotlin
Bruce Eckel and Svetlana IsakovaFor both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!
C++ Best Practices
Jason TurnerLevel up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
Introducing EventStorming
Alberto BrandoliniThe deepest tutorial and explanation about EventStorming, straight from the inventor.
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
Everyday Rails - RSpecによるRailsテスト入門
Junichi Ito (伊藤淳一), AKIMOTO Toshiharu, 魚振江, and Aaron SumnerRSpecを使ってRailsアプリケーションに信頼性の高いテストを書く実践的なアドバイスを提供します。詳細で丁寧な説明は本書のオリジナルコンテンツです。また、説明には実際に動かせるサンプルアプリケーションも使用します。本書は2017年版にアップデートされ、RSpec 3.6やRails 5.1といった新しい環境に対応しています!さあ、自信をもってテストできるようになりましょう!
R Programming for Data Science
Roger D. PengThis book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
The Hundred-Page Machine Learning Book
Andriy BurkovEverything you really need to know in Machine Learning in a hundred pages.
Continuous Delivery Pipelines
Dave FarleyThis practical handbook provides a step-by-step guide for you to get the best continuous delivery pipeline for your software.
Top Bundles
- #1
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #2
All the Books of The Medical Futurist
6 Books
We put together the most popular books from The Medical Futurist to provide a clear picture about the major trends shaping the future of medicine and healthcare. Digital health technologies, artificial intelligence, the future of 20 medical specialties, big pharma, data privacy, digital health investments and how technology giants such as Amazon... - #3
PowerShell
3 Books
Buy every PowerShell book from Adam Bertram at a 20% discount! - #4
Cisco CCNA 200-301 Complet
4 Books
Ce lot comprend les quatre volumes du guide préparation à l'examen de certification Cisco CCNA 200-301. - #5
Software Architecture and Beautiful APIs
2 Books
There is no better way to learn how to design good APIs than to look at many existing examples, complementing the Software Architecture theory on API design. - #6
Linux Administration Complet
4 Books
Ce lot comprend les quatre volumes du Guide Linux Administration :Linux Administration, Volume 1, Administration fondamentale : Guide pratique de préparation aux examens de certification LPIC 1, Linux Essentials, RHCSA et LFCS. Administration fondamentale. Introduction à Linux. Le Shell. Traitement du texte. Arborescence de fichiers. Sécurité... - #7
Learn Git, Bash, and Terraform the Hard Way
3 Books
Learn Git, Bash and Terraform using the Hard Way method.These technologies are essential tools in the DevOps armoury. These books walk you through their features and subtleties in a simple, gradual way that reinforces learning rather than baffling you with theory. - #8
9 Books-Bundle: Shut Up and Code!
9 Books
"Shut up and code." Laughter in the audience. The hacker had just plugged in his notebook and started sharing his screen to present his super-smart Python script. "Shut up and code" The letters written in a white literal coding font on black background was the hackers' home screen background mantra. At the time, I was a first-year computer... - #9
Mastering Containers
2 Books
Docker and Kubernetes are taking the world by storm! These books will get you up-to-speed fast! Docker Deep Dive is over 400 pages long, and covers all objectives on the Docker Certified Associate exam.The Kubernetes Book includes everything you need to get up and running with Kubernetes! - #10
CCDE Practical Studies (All labs)
3 Books
CCDE lab