signal slots
Qt Memory Management & Signal and Slots | PPT
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Qt 5 C++ – Cơ chế hoạt động của Signal và Slot | Phở Code
Your class must inherit from QObject (through QWidget for example) to be able to use the signal/slot mechanism. ... Linking the signals and slots require to know which object must be linked to which, and which function is linked to which signal.
std::signal
When signal handler is set to a function and a signal occurs, it is implementation defined whether std::signal(sig, SIG_DFL) will be executed immediately before the start of signal handler.