Book Image

C++17 STL Cookbook

By : Jacek Galowicz
Book Image

C++17 STL Cookbook

By: Jacek Galowicz

Overview of this book

C++ has come a long way and is in use in every area of the industry. Fast, efficient, and flexible, it is used to solve many problems. The upcoming version of C++ will see programmers change the way they code. If you want to grasp the practical usefulness of the C++17 STL in order to write smarter, fully portable code, then this book is for you. Beginning with new language features, this book will help you understand the language’s mechanics and library features, and offers insight into how they work. Unlike other books, ours takes an implementation-specific, problem-solution approach that will help you quickly overcome hurdles. You will learn the core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on practical real-world recipes. These recipes will help you get the most from the STL and show you how to program in a better way. By the end of the book, you will be up to date with the latest C++17 features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (18 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Removing consecutive whitespace between words


Because strings are often read from user input, they may contain wild formatting and often need to be sanitized. One example of this is strings containing too many whitespace.

In this section, we will implement a slick whitespace filtering algorithm, which removes excess whitespace from strings but leaves single whitespace characters untouched. We call that algorithm remove_multi_whitespace, and its interface will look very STL-like.

How to do it...

In this section, we will implement the remove_multi_whitespace algorithm and check out how it works:

  1. As always, we do some includes first and then declare that we use the std namespace by default:
      #include <iostream>
      #include <string>
      #include <algorithm>      

      using namespace std;
  1. We implement a new STL-style algorithm called remove_multi_whitespace. This algorithm removes clustered occurrences of whitespace, but no single spaces. This means that a string line...