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Modern C++ Programming Cookbook

You're reading from   Modern C++ Programming Cookbook Master Modern C++ with comprehensive solutions for C++23 and all previous standards

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Product type Paperback
Published in Feb 2024
Publisher Packt
ISBN-13 9781835080542
Length 816 pages
Edition 3rd Edition
Languages
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Author (1):
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Marius Bancila Marius Bancila
Author Profile Icon Marius Bancila
Marius Bancila
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Toc

Table of Contents (15) Chapters Close

Preface 1. Learning Modern Core Language Features 2. Working with Numbers and Strings FREE CHAPTER 3. Exploring Functions 4. Preprocessing and Compilation 5. Standard Library Containers, Algorithms, and Iterators 6. General-Purpose Utilities 7. Working with Files and Streams 8. Leveraging Threading and Concurrency 9. Robustness and Performance 10. Implementing Patterns and Idioms 11. Exploring Testing Frameworks 12. C++ 20 Core Features 13. Other Books You May Enjoy
14. Index

Handling friendship with the attorney-client idiom

Granting functions and classes access to the non-public parts of a class with a friend declaration is usually seen as a sign of bad design, as friendship breaks encapsulation and ties classes and functions. Friends, whether they are classes or functions, get access to all the private members of a class, although they may only need to access parts of it.

The attorney-client idiom provides a simple mechanism to restrict friends access to only designated private members of a class.

Getting ready

To demonstrate how to implement this idiom, we will consider the following classes: Client, which has some private member data and functions (the public interface is not important here), and Friend, which is supposed to access only parts of the private details, for instance, data1 and action1(), but has access to everything:

class Client
{
  int data_1;
  int data_2;
  void action1() {}
  void action2() {}
  friend class Friend...
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