C++

18.2    Nonpublic Inheritance

When a class inherits something from a predecessor, you normally bring in the base class with public:

class Base {};class Derived : public Base {    ...};  

This suggests that there are other possibilities. protected and private are also possible here, and this affects the visibility of the inherited fields and methods.

// https://godbolt.org/z/eKbK39nG1class Base {public:    int xPublic = 1;protected:    int xProtected = 2;private:    int xPrivate = 3;};class DerivedPublic : public Base {    // xPublic becomes 'public'    // xProtected becomes 'protected'    // xPrivate is not visible here};class DerivedProtected : protected Base {    // xPublic becomes 'protected'    // xProtected becomes 'protected'    // xPrivate is not visible here};class ...