When the header is not even C++

The long list of standard-non-compliant-but-still-working-and-useful features does not end with the preceding examples. However, if we had only focused our attention on those, we could still have filled several books with them. Sadly, for the moment, we have only dedicated one chapter to this topic, so let’s move our attention to somewhat more exotic features.

Qt has been the de-facto cross-platform programming framework for GUI applications (but not only) for quite some time. Throughout its fateful history, while exchanging owners several times since its inception in 1994, the Qt framework has evolved significantly, with each release giving a new set of features to the C++ (but not only) programming community. However, one feature has remained more or less the same: the signal/slot implementation and the Meta Object Compiler (MOC). The pillar of the framework, the MOC makes it possible to connect events from components (i.e., signals) to receivers...