AndreasFertig.com

More C++26 reflection at compile-time

Andreas Fertig — Tue, 02 Jun 2026 00:00:00 +0000

In today's post, I like touch-up on C++26's static reflection. In case you haven't seen, I wrote a first post C++26 reflection at compile-time a while ago.

One of the great things about reflection is that we can already explore the new feature since with Clang there is …

C++ Insights Episode 74: Why move requires noexcept in C++20

Andreas Fertig — Wed, 20 May 2026 00:00:00 +0000

I published a new C++ insights episode: Why move requires noexcept in C++20.

In this episode, you'll learn why noexcept is crucial for move operations of a class.

Andreas

Happy 8th anniversary C++ Insights

Andreas Fertig — Wed, 13 May 2026 00:00:00 +0000

This year, we celebrate the 8th anniversary of C++ Insights!

Thank you all for the wonderful years of support!

The current status

I've been a bit slower in updating C++ Insights to work with the latest Clang version. As a birthday gift I released the latest C++ Insights version which …

From Undefined to Defined: Using std::launder in C++

Andreas Fertig — Tue, 05 May 2026 00:00:00 +0000

In today's post, I will continue with the overall topics of the last two months. Today you'll learn when and where you need to apply C++17's std::launder and where the difference to this utility is to reinterpret_cast or std::start_lifetime_as.

The fields where you can apply today's learning …

C++ Insights Episode 73: Things you can do effortlessly with C++20s concepts

Andreas Fertig — Wed, 15 Apr 2026 00:00:00 +0000

I published a new C++ insights episode: Things you can do effortlessly with C++20s concepts.

In this episode, you'll learn how C++20s concepts help you to write less code that's easier to maintain at the same time.

Andreas

Open-Enrollment classes in 2026

Andreas Fertig — Tue, 14 Apr 2026 00:00:00 +0000

The year 2026 is already four months old. I hope you had a good start to this year. If you're interested in working with me at one of my public classes, here is what you need to know.

I will give a one-day online workshop on Safe and Efficient C …

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 …