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Francois Bertel authored
STYLE:Added a section about the meaning of callData, per invoked event and per class invoking this event. This section is based on a grep about InvokeEvent on the source tree and a manual read through the source code to find the type of callData and how, for the same event, the callData can differ. Previously, the user had to read the cxx file of the class (s)he tried to add an observer to, to find out what was returned in callData, not really user-friendly...
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