It's important to notice that you can keep well out of trouble by sticking to the rule of _zero_, i.e. relying on the defaults for copy&move ctors, assignment operators and destructor.

So, the best advice is: Don't mess with the razor blades. And these days, C++ gives you enough in the standard library to avoid messing with them yourself. But since this is C++, you _can_ always open up the safety casing and messing with things, if you really want to.