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 set to sort and filter user input

The set container is an associative container where each element is a single value, which is used as the key. Elements in a set are maintained in sorted order and duplicate keys are not allowed.

The set container is often misunderstood, and it does have fewer and more specific uses than more general containers such as vector and map. One common use for a set is to filter duplicates from a set of values.

How to do it…

In this recipe we will read words from the standard input and filter out the duplicates.

  • We'll start by defining an alias for an istream iterator. We'll use this to get input from the command line.
    using input_it = istream_iterator<string>;
  • In the main() function, we'll define a set for our words:
    int main() {
        set<string> words;

The set is defined as a set of string elements.

  • We define a pair of iterators for use with the inserter() function...