gtkmm was basically the modern c++ competitor of Qt from 20 years ago. Back in the Qt2-3 era, where gtkmm relied on libsigc++ and templates, Qt relied on meta-o

gtkmm was basically the modern c++ competitor of Qt from 20 years ago. Back in the Qt2-3 era, where gtkmm relied on libsigc++ and templates, Qt relied on meta-object compiler for reflection and macros for connecting signals to slots. It also had threading and database interaction. It provided productivity at the cost of being butt-ugly and you had to be confined to their own editor and build system. Fast-forward 20 years, Qt5 got a big makeover and adapted to C++11. It deprecated hacks like QSignalMapper and provided more 3d and multimedia stuff. And Qt6 adapted to CMake. So Qt is pretty nice looking these days.