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QtC++ - Lesson 024 Signals and Slot in Qt5
QtC++ - Lesson 024 Signals and Slot in Qt5
signalslot system ensures the type-correctness of callback arguments Similarly, the signalslot system can be used for other non-GUI usages, for
Usually, a connection can only be made if the slot has the same number of arguments as the signal , and if all the argument types are compatible
signal slot The slot does not exist for the given receiver ; The signalslot argument lists is not compatible The elements marked with a do not
signal and slot And when there is a free standing function there is a signature, but there is no instance, so the third and the fourth arguments of the first
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![signal and slot arguments are not compatible](10071.jpg)