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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
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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

Build your own algorithm: split

The STL has a rich algorithm library. Yet, on occasion you may find it missing something you need. One common need is a split function.

A split function splits a string on a character separator. For example, here's a Unix /etc/passwd file from a standard Debian installation:

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync

Each field is separated by a colon : character, where the fields are:

  1. Login name
  2. Optional encrypted password
  3. User ID
  4. Group ID
  5. Username or comment
  6. Home directory
  7. Optional command interpreter

This is a standard file in POSIX-based operating systems, and there are others like it. Most scripting languages include a built-in function for splitting a string on a separator. There are simple ways to do this in C++. Still, std::string is just another...

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