I've been experimenting with C++ 20 modules.
Modules are a new way of organizing C++ source files, and my development tools have advanced to the point I can do some simple development.
The tools are still in their early stages, but I find the technology interesting, so I made a module version of my logging routines as an experiment.
The sample can be found in my projects tab, C++ Modules Experiment.
It is still too early for me to convert my main projects over to modules, but I look forward to the day I can.