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 cppstories.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 buy 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 lots 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 bartek AT cppstories.com.
About the Author
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
mutableKeyword - Invocation Counter - An Example of Captured Variables
- Capturing Global Variables
- Capturing Statics
-
Capturing a Class Member And the
thisPointer - 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::bind1standstd::bind2ndwith 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
-
constexprLambda Expressions- Examples
- Capturing Variables
-
constexprSummary:
-
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::variantandstd::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
-
constevalLambdas - Capturing a Parameter Pack
- Template Lambdas
- Concepts and Lambdas
-
Changes to Stateless Lambdas
- Even more with unevaluated contexts
-
Lambdas and
constexprAlgorithms - 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
The Leanpub 60-day 100% Happiness Guarantee
Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Do Well. Do Good.
Authors have earned$11,595,069writing, 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
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
- #1
C++20 - The Complete Guide
Nicolai M. JosuttisAll new language and library features of C++20 (for those who know previous C++ versions).
The book presents all new language and library features of C++20. Learn how this impacts day-to-day programming, to benefit in practice, to combine new features, and to avoid all new traps.
Buy early, pay less, free updates.
Other books:
- #2
Jetpack Compose internals
Jorge CastilloJetpack Compose is the future of Android UI. Master how it works internally and become a more efficient developer with it. You'll also find it valuable if you are not an Android dev. This book provides all the details to understand how the Compose compiler & runtime work, and how to create a client library using them.
- #3
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.
- #4
SignalR on .NET 6 - the Complete Guide
Fiodar SazanavetsLearn everything there is to learn about SignalR and how to integrate it with the latest .NET 6 and C# 10 features. Learn how to connect any type of client to SignalR, including plain WebSocket client. Learn how to build interactive applications that can communicate with each other in real time without making excessive calls.
- #5
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.
- #6
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
- #7
Functional event-driven architecture: Powered by Scala 3
Gabriel VolpeExplore the event-driven architecture (EDA) in a purely functional way, mainly powered by Fs2 streams in Scala 3!
Leverage your functional programming skills by designing and writing stateless microservices that scale, powered by stateful message brokers.
- #8
The easiest way to learn design patterns
Fiodar SazanavetsLearn design patterns in the easiest way possible. You will no longer have to brute-force your way through each one of them while trying to figure out how it works. The book provides a unique methodology that will make your understanding of design patterns stick. It can also be used as a reference book where you can find design patterns in seconds.
- #9
CCIE Service Provider Version 4 Written and Lab Exam Comprehensive Guide
Nicholas RussoThe service provider landscape has changed rapidly over the past several years. Networking vendors are continuing to propose new standards, techniques, and procedures for overcoming new challenges while concurrently reducing costs and delivering new services. Cisco has recently updated the CCIE Service Provider track to reflect these changes; this book represents the author's personal journey in achieving that certification.
- #10
Cronache di Domain-Driven Design
Francesco Strazzullo, Matteo Baglini, Gianluca Padovani, Emanuele DelBono, Marco Consolaro, Alessandro Colla, Uberto Barbini, Alberto Acerbis, Julie Camosseto, DDD Open, and Alberto BrandoliniCronache di Domain-Driven Design: un libro corale in italiano fatto di storie indipendenti tra loro, che sono il risultato dell’applicazione di Domain-Driven Design su progetti reali.
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
Practical FP in Scala + Functional event-driven architecture
2 Books
Practical FP in Scala (A hands-on approach) & Functional event-driven architecture, aka FEDA, (Powered by Scala 3), together as a bundle! The content of PFP in Scala is a requirement to understand FEDA so why not take advantage of this bundle!? - #3
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... - #4
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #6
Pattern-Oriented Memory Forensics and Malware Detection
2 Books
This training bundle for security engineers and researchers, malware and memory forensics analysts includes two accelerated training courses for Windows memory dump analysis using WinDbg. It is also useful for technical support and escalation engineers who analyze memory dumps from complex software environments and need to check for possible... - #7
Modern C++ Collection
3 Books
Get All about Modern C++C++ Standard Library, including C++20Concurrency with Modern C++, including C++20C++20Each book has about 200 complete code examples. Updates are included. When I update one of the books, you immediately get the updated bundle. You can expect significant updates to each new C++ standard (C++23, C++26, .. ) and also... - #9
Retromat eBook Bundle for Agile Retrospectives
2 Books
If you facilitate retrospectives this bundle is for you: "Plans for Retrospectives" helps beginners learn the lay of the land with tried-and-true plans. Once you know your way around, "Run great agile retrospectives" contains all 135+ activities in Retromat for you to mix and match.
