AndreasFertig.com

iX Article: Neue Features in C++26

Andreas Fertig — Thu, 09 Apr 2026 00:00:00 +0000

An article I wrote for the German iX magazine "Neue Features in C++26" is available in issue 2026/04. It is available as a printed edition as well as online.

I hope you find the article both interesting and inspiring.

Andreas

What reinterpret_cast doesn't do

Andreas Fertig — Tue, 07 Apr 2026 00:00:00 +0000

In today's post, I will explain one of C++'s biggest pitfalls: reinterpret_cast. Another title for this post could be: This is not the cast you're looking for!

My motivation

My motivation for this blog post comes from multiple training classes I thought over the past several months and a …

C++ Insights Episode 72: Why you should never call a virtual member function in a constructor

Andreas Fertig — Wed, 18 Mar 2026 00:00:00 +0000

I published a new C++ insights episode: Why you should never call a virtual member function in a constructor.

In this episode, you'll learn by example why you should never call a virtual member function from a constructor.

Andreas

Best performance of a C++ singleton

Andreas Fertig — Tue, 03 Mar 2026 00:00:00 +0000

In my Januray post, I focused on implementing a singleton correctly. This time I want to add performance into the mix and show you the best way to implement your singleton... or give you guidance to pick your best way.

Setting the scene

I'm using a display manager as an …

C++ Insights Episode 71: C++23: multidimensional operator[]

Andreas Fertig — Wed, 18 Feb 2026 00:00:00 +0000

I published a new C++ insights episode: C++23: multidimensional operator[].

In this episode, you'll learn about the change to the operator[] in C++23.

Andreas

CppCon 2025 recording of my talk "Back to Basics: static, inline, const, and constexpr" is available

Andreas Fertig — Tue, 17 Feb 2026 00:00:00 +0000

I'm pleased to announce that the recording of my talk at CppCon Back to Basics: static, inline, const, and constexpr of my presentation is available YouTube:

You can find the slides of this talk on my talks and training page. This site also contains details about my other public appearances …

The Reset trick

Andreas Fertig — Tue, 03 Feb 2026 00:00:00 +0000

My last month's post, Singleton done right in C++, has triggered plenty of comments. I expected a few, but not that much. So thank you for keeping the conversation going.

As I said in my previous post, this is not to advertise singletons at all. It is just if you …

C++ Insights Episode 70: Efficiently passing a std::source_location object

Andreas Fertig — Wed, 21 Jan 2026 00:00:00 +0000

I published a new C++ insights episode: Efficiently passing a std::source_location object.

In this episode, I'll answer a question from a viewer about how to efficiently pass a std::source_location object.

Andreas

Singleton done right in C++

Andreas Fertig — Tue, 06 Jan 2026 00:00:00 +0000

In today's post, I like to touch on a controversial topic: singletons. While I think it is best to have a codebase without singletons, the real-world shows me that singletons are often part of codebases.

Since at least for the code that I see singletons exists, let's make sure you …

C++ Insights Episode 69: = default and uniform initialization - Best Practice Explained

Andreas Fertig — Wed, 17 Dec 2025 00:00:00 +0000

I published a new C++ insights episode: = default and uniform initialization - Best Practice Explained.

In this episode, you'll learn a best practice using =default and uniform initialization.

Andreas

C++20s std::source_location in action

Andreas Fertig — Tue, 02 Dec 2025 00:00:00 +0000

In today's post, I want to address a question I'm getting occasionally when teaching a C++20 class. From the plenty of new features that we got with C++20, one sticks out as special: std::source_location. Let's dive in to how this element is special and how to use …

C++ Insights Episode 68: C++20: Making constructors smarter with conditional explicit

Andreas Fertig — Wed, 19 Nov 2025 00:00:00 +0000

I published a new C++ insights episode: C++20: Making constructors smarter with conditional explicit.

In this episode, you'll learn about the power of C++20's conditional explicit.

Andreas

C++20s concepts with a forward declared type

Andreas Fertig — Tue, 04 Nov 2025 00:00:00 +0000

In today's post, I would like to continue talking about forward declared or better incomplete types in C++.

I discussed some scenarios in last months post Forward declaring a type in C++: The good, and the bad. Today I like to add another flavor, C++20s concepts.

It depends

It's …

Second Edition: Master Modern C++ - With Me as Your Personal Guide

Andreas Fertig — Fri, 17 Oct 2025 00:00:00 +0000

The first edition sold out fast — and after all the great feedback and success stories, I’m thrilled to open Edition 2 of my special bundle: Programming with C++17 and C++20 self-study course plus four 30-minute 1:1 coaching sessions with me.

This is not just another course …

C++ Insights Episode 67: C++23: Why if consteval can make your code better

Andreas Fertig — Wed, 15 Oct 2025 00:00:00 +0000

I published a new C++ insights episode: C++23: Why if consteval can make your code better.

In this episode, you'll learn how C++23's if consteval helps you avoiding mistakes.

Andreas

Forward declaring a type in C++: The good, and the bad

Andreas Fertig — Tue, 07 Oct 2025 00:00:00 +0000

In today's post, I would like to shed some light on the implications of forward declaring a type in C++.

The most common pattern I know is when we want to hide the implementation of a class type, we forward declare that class like this:

C++ Insights Episode 66: How C++23 handles temporary objects in range-based for-loops

Andreas Fertig — Wed, 17 Sep 2025 00:00:00 +0000

I published a new C++ insights episode: How C++23 handles temporary objects in range-based for-loops.

In this episode, you'll learn how C++23 reduces undefined behavior in range-based for-loops for you.

Andreas

Efficient C++: The hidden compile-time cost of auto return types

Andreas Fertig — Tue, 02 Sep 2025 00:00:00 +0000

In today's post, I would like to dive into writing efficient C++ code. As you probably know, one post will not cover this entire topic. For today's post, I like to focus on controlling your compile-times, picking one element out of the language: auto.

I would like to start by …

C++ Insights Episode 65: C++26: Pack expansions for parameter packs

Andreas Fertig — Wed, 20 Aug 2025 00:00:00 +0000

I published a new C++ insights episode: C++26: Pack expansions for parameter packs.

In this episode, you'll learn about the new ways you have in C++26 using parameter packs.

Source code: https://cppinsights.io/s/a92bbe57 https://cppinsights.io/s/c6d94ea3

Andreas

Master Modern C++ - With Me as Your Personal Guide

Andreas Fertig — Thu, 14 Aug 2025 00:00:00 +0000

You asked for it, and I listened.

This September, I’m offering a special bundle: my Programming with C++17 and C++20 self-study course plus four 30-minute 1:1 coaching sessions with me.

This isn’t just a course. It’s a complete learning experience.

You’ll work through …