Does a static member inside a nested class have static duration for the enclosing class?

Question

If I have nested classes, and these nested classes have static members, will those members still be static for the enclosing class? For example, if I have

class Enclosing {
public:
    Enclosing();
private:
    class Nested {
    public:
        Nested();
    private:
        static int thing;
    };
};

If I do

auto A = Enclosing();
auto B = Enclosing();

Will A and B be able to have different values for thing?

Answer 1

Will A and B be able to have different values for thing?

No they won't have different values. All instances will see the same value for thing; the nesting of the class has no impact here.

static member variables are "associated with the class" (i.e. over non-static members that are associated with the instances of the class). From cppreference;

Static data members are not associated with any object. They exist even if no objects of the class have been defined. If the static member is declared thread_local (since C++11), there is one such object per thread. Otherwise, there is only one instance of the static data member in the entire program, with static storage duration.

Live sample.