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

Trimming whitespace from the beginning and end of strings


Especially when obtaining strings from user input, they are often polluted with unneeded white space. In another recipe, we removed excess whitespace that occurred between words.

Let's now have a look at strings that are surrounded by whitespace and remove that. The std::string has some nice helper functions for getting this job done.

Note

After reading this recipe that shows how to do this with plain string objects, make sure to also read the following recipe. There we will see how to avoid unnecessary copies or data modifications with the new std::string_view class.

How to do it...

In this section, we will write a helper function that identifies surrounding white space in a string and returns a copy without that, and then we are going to test it briefly.

  1. As always, the header includes and using directive come first:
      #include <iostream>
      #include <string>
      #include <algorithm>
      #include <cctype...