Modern C++ Design Patterns

Klaus Iglberger

one day workshop
10:30-19:15, Wednesday, 30th June 2021

Design patterns have proven to be useful over several decades and knowledge about them is still very useful to design robust, decoupled systems. Modern C++, however, has profoundly changed the way we use C++, think about design and implement solutions. This workshop explores modern C++ design and the modern forms of the classical design patterns. It will provide a deeper understanding of software design in general and design patterns in particular. It will give advice on how to decouple software systems and teach guidelines, idioms and best practices for sustainable and maintainable design. Amongst others it will answer the following questions:

  • How does good C++ design with a minimum of dependencies look like?
  • What are the most important rules for robust, maintainable, and sustainable design?
  • What are the most common pitfalls in C++ software design?
  • Why does classical C++ design based on inheritance hierarchies fail so often?
  • What is "Value Semantics"?
  • How are the classical design patterns realised in modern C++?
  • What are alternatives to the classical design patterns?
  • Which tools are available to support good C++ design?

Software Design & Design Patterns

  • The Goals of Software Design
  • The Purpose of Design Patterns
  • The Perils of Inheritance
  • Value Semantics vs. Reference Semantics

Classic Design Patterns Revisited

  • Visitor
  • Command
  • Prototype
  • Strategy
  • Visitor
  • Decorator
  • Bridge
  • External Polymorphism

Modern C++ Design Patterns

  • Type Erasure
  • Expression Templates
  • CRTP

We will work through a number of hands on programming tasks, for which you are expected to use your own machine. Any operating system (Windows, Linux, MacOS, ...), any IDE/editor (MS Visual Studio, CLion, vi, emacs, ...) and any compiler capable of at least C++14 (GCC, Clang, MSVC, ...) can be used. For your convenience, both CMake and Make files will be provided. Please note that some programming tasks will require C++20 to compile. Also note that after the training you’ll additionally get the solutions to the programming tasks.

Klaus Iglberger

Klaus Iglberger is a freelancing C++ trainer and consultant. He has finished his PhD in computer science in 2010 and since then is focused on large-scale C++ software design. He shares his experience in popular advanced C++ courses around the world (mainly in Germany, but also the EU and US). Additionally, he is the initiator and lead designer of the Blaze C++ math library ( and a (co-)organizer of the Munich C++ user group (