I need to change a state. Then do stuff. Then reset the state back to what it was - e.g:
auto oldActivationOrder = mdiArea->activationOrder();
mdiArea->setActivationOrder( QMdiArea::StackingOrder );
mdiArea->cascadeSubWindows();
mdiArea->setActivationOrder( oldActivationOrder );
How do I do this in a RAII way? (c++ 11 and/or 14)
Edit: Thanks for all the answers.
There are several suggestions to create a custom class for handling the state change (BoBTFish, mindriot, Mattias Johansson). This solution seems good and clear. However I think it is a drawback that it increases the line count from 4 to 20+. If used a lot this would bloat the code. Also it seems that some locality is lost by having a separate class.
Ami Tavory suggests using std::unique_ptr. This does not have the code bloat issue and maintains locality. However, as Ami also indicates, it may not be the most readable solution.
sp2danny suggests a generalized state-change class that can be reused. This avoids code bloat provided that it can replace several custom classes. I'm going to accept this answer - but I guess the right approach really depends on the context.