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Code is here
void A::fun()
{
QAction* act = new QAction(this);
QAction* act2 = new QAction(this);
connect(act, QAction::triggered, [this, &act2]() {...; act2.setDisable(true);}
// crash when &act2 is used to capture the variable
// but it is okay using act2 to capture the variable
}
What is the reason? Thanks.
You are taking a reference of
act2even though it is a pointer that will go out scope, that is why copying the pointer works.