SignalSlot Communication

Qt Signals and Slots: A Comprehensive Guide qt signal and slot QT signalslot is not a mechanism of C++, it's just a C++ library which provides such functionality You can implement it yourself with Rust, or qt slot Qt Signal & Slot implementation is deterministic, but it's using QVariant to box and then unbox values, so there is definitely a performance

qt connect signal to slot with parameter Welcome to Signals and Slots in Qt