何时以及为什么超类运算符重载隐藏在子类中？

Question

I'm aware that if a subclass provides an operator method (let's say assignment), this hides that operator in the superclass unless you explicitly do using superclass::operator= but in my code, I've seen cases I need to do this even when the sub-class does not implement any operators at all.

Is there a concrete list of cases where operators (and other moethds if it's a general case) will be hidden and where they won't?

Answer 1

Related: Trouble with inheritance of operator= in C++ .

operator= is the only member function (other than constructors and destructor) that's compiler-generated, and hence the only function that's hidden even when not user-declared in the derived class.