misje / once Goto Github PK

In order to easily convey the purpose of once a few good use cases should be presented in the README. Example test code should implement them. Personally I have a hard time finding good examples that are not in proprietary code, so help is appreciated!

Have you considered submitting this to Qt codereview? It would be very nice to have this officially in Qt.
Qt 6 will require at least C++11 (maybe even higher), so this implementation should be good to go.

Related Qt bug: https://bugreports.qt.io/browse/QTBUG-44219

Hi! First of all thanks for your small helper. I was also surprised that this functionality has still not included in QT.
The problem is that the member AutoDisconnecter::func is treated as a reference and therefore it saves a reference to the functor object which is not saved elsewhere.
No idea why. You use "Func &&func" so Func should be deduced to the type itself.
It can be easily verified by static_assert( !std::is_reference< decltype( func ) >::value , ""), which won't compile.
The solution can be replacing the member with
std::remove_reference_t< Func > func;
Plus you need to remove const from operator () and call() as they call not-const callable of its member.