Can you get sent into an infinite loop?
Dealing with the pesky std::vector<bool>.
Trying to make a generic solution.
Backing off and retrying, but the detection is the tricky part.
std::vector to a smaller size?
The compiler doesn't know that you're shrinking.
The things that could go wrong before you even start.
Making sure to wrap the right thing.
Intercepting the exception on the front side.
Avoiding dynamic memory allocation.
There's no good way to report the failure, so we just have to give up.