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Compiler Error C3701

'function' : event_source has no events

You attempted to use event_source on a class that has no event methods. To fix this error, add one or more events to the class.

The following sample generates C3701:

// C3701.cpp
[ event_source(native) ]
class CEventSrc {
   // uncomment the following line to resolve this C3701
   // __event void fireEvent(int i);
};   // C3701

int main() {