17.06.2020 
Today’s blog post is about something that should be simple and apparently it causes trouble: how to declare a qHash overload for a custom datatype. This is necessary when we want to use custom datatypes as keys in a QHash. From the documentation: A QHash’s key type has additional requirements other than being an assignable […]
Blog Archives
QStringView Diaries: Zero-Allocation String Splitting QStringTokenizer merged for 6.0
After four months of intensive development work, I am happy to announce that the first QStringTokenizer commits have landed in what will eventually become Qt 6.0. The docs should show up, soon. While the version in Qt will be Qt 6-only, KDAB will release this tool for Qt 5 as part of its KDToolBox productivity […]
Using Visual Studio Code for Qt Applications – Part Two a technical guide
In the last blog post we saw an essential, C++ oriented, Visual Studio Code setup. That was enough to get going right away, but we can still definitely do more and better. Here I’ll show you how to get a complete setup for your qmake and CMake projects, all this while also wearing a Qt […]
Qt, range-based for loops and structured bindings Part 1
Qt has a long history. The first stable version was released before the first version of C++ was standardized and long before the different C++ compiler vendors started shipping usable implementations of the C++ standard library. Because of this, Qt often followed (and still follows) some design idioms that feel unnatural to the usual C++ […]
Using Visual Studio Code for Qt Applications – Part One A Technical Guide
A few weeks ago, we published an article with an overview of Visual Studio Code through the eyes of a Qt developer. In this short blog series, I will show you how to get up to speed with a Qt project using Visual Studio Code more in detail. Before digging into the Qt parts, I’d […]
Getting rid of “volatile” in (some of) Qt
The upcoming version of the C++ Standard (C++2a) is proposing to deprecate certain usages of the volatile keyword, by adopting the P1152 proposal (Deprecating volatile). Despite the somewhat “flamboyant” title, the actual deprecated parts are very limited and indeed the paper limits the deprecation to somehow language/library corner cases and/or dangerous antipatterns. For instance certain […]
How not to lose the alpha channel when converting between QRgb/QColor/QString
Working on color imagery for QiTissue recently, I realized we were accidentally losing the alpha channel in multiple places. For efficiency reasons, we keep colors in memory using the QRgb type, and convert that to/from QString for serialization purposes via QColor as needed. Here’s what I discovered about why that doesn’t work, and some ways […]
Qt World Summit 2019 talk videos are online
Did you miss the past Qt World Summit? Were you there, but you couldn’t attend that talk or two that you really wanted to see because the conference was so, so packed with awesome content? Fear no more! We are glad to announce that the talks at the past Qt World Summit 2019 in Berlin […]
KDAB at Embedded World, Nuremberg 25 - 27 February
Embedded World – 25-27 February 2020 February 2020 will be the tenth year that KDAB exhibits at Embedded World, in Nuremberg, Germany. When we started exhibiting, there were only five halls compared to today’s seven, so the event continues to grow and remain relevant, in a world where most interaction takes place on-line. In those […]
The Future of Embedded Software An industry-wide view of some of the challenges
Download the report As the world continues its steady march towards ubiquitous computing, almost everything from airplanes to toasters is being powered by embedded software. In fact, technology is so pervasive, we take connected homes, advanced medical equipment, and self-driving cars almost for granted. However, many of us who work in the industry have some […]