Multiple dispatch over covariant functions
Today we have another guest post by Alfredo Correa. In his previous article, Functions of variants are covariant, Alfredo described the concept of a covariant function, that is, how a […]
Design Patterns
The pImpl Idiom
The pImpl idiom is a useful idiom in C++ to reduce compile-time dependencies. Here is a quick overview of what to keep in mind when we implement and use it.
Functions of Variants are Covariant
Today I am happy to present a guest post by Alfredo Correa about covariant visitors for std::variant. Alfredo works at Lawrence Livermore National Laboratory where he uses C++ to develop […]
Design Patterns in Real Life
Today, Patrick Mintram presents us with a guest post about design patterns in real life applications. Patrick has been in and around engineering for about 9 years, the last 3 […]
Emerging Patterns – Refactoring Session #4
In my last refactoring session post, I wrote I had been lazy when it came to refactoring Fix. Actually, I’ve slacked on purpose, repeatedly skipping the refactoring steps of the […]
Design for Testability: Separate I/O layers
For my current project, some design decisions had to be made to ensure good testability and test coverage.
Covariance with Smart Pointers
Covariance can be a useful concept, e.g. when implementing the abstract factory design pattern. However, in modern C++, we should return smart pointers that are not recognized to be covariant like […]
Visitor Pattern Part 2 – the enum based visitor
In my last post I showed the Visitor design pattern in its fully object oriented implementation. In the post before that I wrote about moving from enums to class hierarchies. I […]
Visitor Pattern Part 1- the Object Oriented Way
If you have read the “Gang of Four” book about design patterns or just have been long enough in software development, you will have heard of the Visitor pattern. In its fully […]
Singletons – What’s the Deal?
If you like a heated discussion, just pick a few developers and start a conversation about singletons. Sentiments and opinions about that particular design pattern are all over the place. For […]