The Anatomy of C++ Lambdas

You want to finally understand C++ lambdas? Once you understand them, your C++ code will never be the same. In a good way.

The Anatomy of C++ Lambdas is a focused, example-rich guide to what lambdas really are, how they work under the hood, and how to use them effectively. It starts with why lambdas exist and what a lambda is (an unnamed function object that can capture variables in scope), and then builds up to practical use.

Inside you will find:
Lambda syntax, piece by piece: captures by value and by reference, capture-all, the most common pitfall, capturing this, init-capture, mutable and static captures, parameters (including auto, template parameters and the explicit object parameter), the body, the return value, specifiers and the extended lambda form.

Passing lambdas to other code, as a template or as a std::function, and what that means for performance and memory.

Lambdas in practice: algorithms, callbacks, nesting lambdas, immediately invoked function expressions, little helpers, converting a lambda to a C function pointer, std::visit and custom deleters.

The book is a compact PDF of over 40 pages, and the source code of all examples is free on GitHub.

Who is it for? Anyone who is unfamiliar with lambdas and wants to know what all the possibilities are, and anyone who already uses them and wants to understand what the compiler really does with them.

Consider this book your multi-vitamin subscription, the gut-healing medicine that gives your code the boost you were looking for. The doctor is in.

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