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)

Use lambdas for scoped reusable code

Lambda expressions can be defined and stored for later use. They can be passed as parameters, stored in data structures, and called in different contexts with different parameters. They are as flexible as functions, but with the mobility of data.

How to do it…

Let's start with a simple program that we'll use to test various configurations of lambda expressions:

  • We'll first define a main() function and use it to experiment with lambdas:
    int main() {
        ... // code goes here
    }
  • Inside the main() function, we'll declare a couple of lambdas. The basic definition of a lambda requires a pair of square brackets and a block of code in curly brackets:
    auto one = [](){ return "one"; };
    auto two = []{ return "two"; };

Notice that the first example one includes parentheses after the square brackets, and the second example two does not. The empty parameter parentheses are...