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C++20 STL Cookbook

You're reading from   C++20 STL Cookbook Leverage the latest features of the STL to solve real-world problems

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Product type Paperback
Published in May 2022
Publisher Packt
ISBN-13 9781803248714
Length 450 pages
Edition 1st Edition
Tools
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Author (1):
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Bill Weinman Bill Weinman
Author Profile Icon Bill Weinman
Bill Weinman
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Table of Contents (13) Chapters Close

Preface 1. Chaper 1: New C++20 Features 2. Chapter 2: General STL Features FREE CHAPTER 3. Chapter 3: STL Containers 4. Chapter 4: Compatible Iterators 5. Chapter 5: Lambda Expressions 6. Chapter 6: STL Algorithms 7. Chapter 7: Strings, Streams, and Formatting 8. Chapter 8: Utility Classes 9. Chapter 9: Concurrency and Parallelism 10. Chapter 10: Using the File System 11. Chapter 11: A Few More Ideas 12. Other Books You May Enjoy

Use string_view as a lightweight string object

The string_view class provides a lightweight alternative to the string class. Instead of maintaining its own data store, string_view operates on a view of a C-string. This makes string_view smaller and more efficient than std::string. It's useful in cases where you need a string object but don't need the more memory- and computation-intensive features of std::string.

How to do it…

The string_view class looks deceptively similar to the STL string class, but it works a bit differently. Let's consider some examples:

  • Here's an STL string initialized from a C-string (array of char):
    char text[]{ "hello" };
    string greeting{ text };
    text[0] = 'J';
    cout << text << ' ' << greeting << '\n';

Output:

Jello hello

Notice that the string does not change when we modify the array. This is because the string constructor creates its own copy...

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