Callbacks vs signal - slot : rQt5

Qt Creator: Signal Widgets and Slot Widgets with Example programs signal and slot If you write code that does extensive computation or otherwise ties up the program, then control can't return to the event loop, and signals and signal slot qt Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal Qt's signals and slots mechanism

signal slot In signal-slot mechanism, very similar to observer pattern, you connect a signal to a slot, and when that signal is emitted, all slots are