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)

Convert numbers to words

Over the course of my career, I've used a lot of programming languages. When learning a new language, I like to have a project to work on that exposes me to the nuances of the language. The numwords class is one of my favorite exercises for this purpose. I have written it in dozens of languages over the years, including several times in C and C++.

numwords is a class that spells out a number in words. It can be useful for banking and accounting applications. It looks like this in use:

int main() {
    bw::numword nw{};
    uint64_t n;
    nw = 3; bw::print("n is {}, {}\n", nw.getnum(), nw);
    nw = 47; bw::print("n is {}, {}\n", nw.getnum(), nw);
    n = 100073; bw::print("n is {}, {}\n", n, 
      bw::numword{n});
    n = 1000000001; bw::print("n is {}, {}\n&quot...