Back to Basics Designing Classes (part 1 of 2) Klaus Iglberger, CppCon 2021 klaus.iglberger@gmx.de2 Klaus Iglberger C++ Trainer/Consultant Author of the C++ math library (Co-)Organizer Beck, TDD by Example)The Challenge of Class Design 10 Guideline: Design classes for easy change. Guideline: Design classes for easy extensions.Design Guidelines 11 Back to Basics: Class Design (Part ) const; 23 Using inheritance naively to solve our problem easily leads to … … many derived classes; … ridiculous class names; … deep inheritance hierarchies; … duplication between similar implementations

Back to Basics Designing Classes (part 1 of 2) Klaus Iglberger, CppCon 2021 klaus.iglberger@gmx.de2 Klaus Iglberger C++ Trainer/Consultant Author of the C++ math library (Co-)Organizer duplication to enable you to change everything in one place (the DRY principle). Guideline: Design classes for easy change.Data Member Initialization 24 struct Widget { Widget() : Widget(42) // Decisions 63 Guideline: Encapsulate design decisions (i.e. variation points). Guideline: Design classes for easy change.Qualified/Modified Member Data 64 Back to Basics: Class Design (Part 1) The Challenge

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4 The VirtualBox shell 50 5 Classes (interfaces) 52 5.1 IAdditionsFacility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . virtualization engine below. It is completely documented in this SDK Reference – see chapter 5, Classes (interfaces), page 52 and chapter 6, Enumerations (enums), page 351 – and available to anyone who client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes that allow you to use the web service in an object-oriented, straightforward manner. We shall refer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4 The VirtualBox shell 50 5 Classes (interfaces) 52 5.1 IAdditionsFacility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . virtualization engine below. It is completely documented in this SDK Reference – see chapter 5, Classes (interfaces), page 52 and chapter 6, Enumerations (enums), page 350 – and available to anyone who client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes that allow you to use the web service in an object-oriented, straightforward manner. We shall refer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4 The VirtualBox shell 48 5 Classes (interfaces) 50 5.1 IAdditionsFacility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . virtualization engine below. It is completely documented in this SDK Reference – see chapter 5, Classes (interfaces), page 50 and chapter 6, Enumerations (enums), page 317 – and available to anyone who client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes that allow you to use the web service in an object-oriented, straightforward manner. We shall refer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4 The VirtualBox shell 48 5 Classes (interfaces) 50 5.1 IAdditionsFacility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . virtualization engine below. It is completely documented in this SDK Reference – see chapter 5, Classes (interfaces), page 50 and chapter 6, Enumerations (enums), page 317 – and available to anyone who client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes that allow you to use the web service in an object-oriented, straightforward manner. We shall refer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4 The VirtualBox shell 42 5 Classes (interfaces) 44 5.1 IAdditionsFacility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . virtualization engine below. It is completely documented in this SDK Reference – see chapter 5, Classes (interfaces), page 44 and chapter 6, Enumerations (enums), page 289 – and available to anyone who client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes that allow you to use the web service in an object-oriented, straightforward manner. We shall refer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4 The VirtualBox shell 42 5 Classes (interfaces) 44 5.1 IAdditionsFacility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . virtualization engine below. It is completely documented in this SDK Reference – see chapter 5, Classes (interfaces), page 44 and chapter 6, Enumerations (enums), page 262 – and available to anyone who client code that uses the web service: a) For Java as well as Python, the SDK contains easy-to-use classes that allow you to use the web service in an object-oriented, straightforward manner. We shall refer

Explanation and analysis of some key concepts in django CMS. Reference Technical reference material, for classes, methods, APIs, commands. Join us online The django CMS Association [https://www.django-cms.org/en/about-us/] makemigrations polls_cms_integration python manage.py migrate polls_cms_integration Note All plugin classes must inherit from cms.plugin_base.CMSPluginBase and must register themselves with the plugin_pool is the full example: This is just a basic example, and there’s a lot more to django CMS toolbar classes than this - see How to extend the Toolbar for more. from cms.utils.urlutils import admin_reverse

Consulting, Inc. www.stevedewhurst.com 1 Copyright © 2020 by Stephen C. Dewhurst and Daniel Saks C++ Classes  Only non-static data declarations in a class definition add anything to the size of class objects duration.  Therefore, we won’t be discussing static data members.  Type member (included nested classes) do not affect class layout.  Non-virtual member functions have no effect on class layout.  However Space…  An empty class has no non-static data members, no virtual functions, and no virtual base classes.  We often call these types/objects/closures “stateless.”  However, even an empty class must occupy