Book Image

C++20 STL Cookbook

By : Bill Weinman
Book Image

C++20 STL Cookbook

By: Bill Weinman

Overview of this book

Fast, efficient, and flexible, the C++ programming language has come a long way and is used in every area of the industry to solve many problems. The latest version C++20 will see programmers change the way they code as it brings a whole array of features enabling the quick deployment of applications. This book will get you up and running with using the STL in the best way possible. Beginning with new language features in C++20, this book will help you understand the language's mechanics and library features and offer insights into how they work. Unlike other books, the C++20 STL Cookbook takes an implementation-specific, problem-solution approach that will help you overcome hurdles quickly. You'll learn core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on real-world recipes. This book is a reference guide for using the C++ STL with its latest capabilities and exploring the cutting-edge features in functional programming and lambda expressions. By the end of the book C++20 book, you'll be able to leverage the latest C++ features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (13 chapters)

Lambda expressions

A lambda is essentially an anonymous function as a literal expression:

auto la = []{ return "Hello\n"; };

The variable la may now be used as if it were a function:

cout << la();

It can be passed to another function:


It can be passed to another lambda:

const auto la = []{ return "Hello\n"; };
const auto lb = [](auto a){ return a(); };
cout << lb(la);



Or it can be passed anonymously (as a literal):

const auto lb = [](auto a){ return a(); };
cout << lb([]{ return "Hello\n"; });


The term closure is often applied to any anonymous function. Strictly speaking, a closure is a function that allows the use of symbols outside its own lexical scope.

You may have noticed the square brackets in the definition of a lambda:

auto la = []{ return "Hello\n"; };

The square brackets are used to specify a list of captures. Captures are outside variables...