This reminds me of functions that rely on properties, but the properties could, themselves, be functions (in Swift, we call them "computed properties," and they

This reminds me of functions that rely on properties, but the properties could, themselves, be functions (in Swift, we call them "computed properties," and they are indistinguishable, on the outside, from stored properties). C++ can also have a lot of tripwires, from overloaded operators (same with Swift, but people don't overload operators very often, in Swift. They compute properties, all the time, though).