The example of member access operator -> overloading.

operator_overloading.cpp

#include <iostream>

struct Origin {
    int a;
};

struct Wrapper {
    Origin *orig;
    Origin *operator->() const {
        return orig;
    }
};

struct Wrapper2 {
    Wrapper *wrap;
    Wrapper& operator->() const {
        return *wrap;
    }
};

int main() {
    Origin o;
    o.a = 7;
    Wrapper w;
    w.orig = &o;
    Wrapper2 w2;
    w2.wrap = &w;
    std::cout << "w->a" << "\t\t\t\t" << w->a << std::endl;
    std::cout << "w.operator->()" << "\t\t\t" << w.operator->() << std::endl;
    std::cout << "w.operator->()->a" << "\t\t" << w.operator->()->a << std::endl;
    std::cout << "w2->a" << "\t\t\t\t" << w2->a << std::endl;
    std::cout << "&w2.operator->()" << "\t\t" << &w2.operator->() << std::endl;
    std::cout << "w2.operator->()->a" << "\t\t" << w2.operator->()->a << std::endl;
    std::cout << "w2.operator->().operator->()" << "\t" << w2.operator->().operator->() << std::endl;
    std::cout << "w2.operator->().operator->()->a" << "\t" << w2.operator->().operator->()->a << std::endl;
}