Qt Tutorials For Beginners - Qt Signal and slots -

Sometimes it's useful to establish a connection between a signal and a slot that should be activated only once This is not how signalslot

In each QMetaObject, the slots, signals and other invokable methods of that object are given an index, starting from 0 They are ordered so that

signal slot 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 and slot arguments are not compatible In addition to all features provided by Qt the ROOT version supports connecting slots to a class These slots