#include <iostream>

using namespace std;

class A {
  protected:
    typedef A self_t;
    
  public:
    A(){}
    virtual ~A() {}
  
    self_t &operator=(const self_t &a){
      cout << "A::operator=(A)";
      return *this;
    }
    
    void hoge(const self_t &a){
      cout << "A::hoge(A)";
    }
};

class B : public A {
  protected:
    typedef A super_t;
    typedef B self_t;
    
  public:
    B() : super_t() {}
    ~B() {}
    self_t &operator=(const A &a){
      cout << "B::operator=(A)";
      return *this;
    }
    
    void hoge(const A &a){
      cout << "B::hoge(A)";
    }
};

class C : public B {
  protected:
    typedef A base_t;
    typedef B super_t;
    typedef C self_t;
  
  public:
    C() : super_t() {}
    ~C(){}
    self_t &operator=(const A &a){
      cout << "C::operator=(A)";
      return *this;
    }
    
    void hoge(const A &a){
      cout << "C::hoge(A)";
    }
};


int main(){
  A a;
  B b;
  C c;
  
  cout << "a = a => "; a = a; cout << endl;
  cout << "a = b => "; a = b; cout << endl;
  cout << "a = c => "; a = c; cout << endl;
  
  cout << "b = a => "; b = a; cout << endl;
  cout << "b = b => "; b = b; cout << endl;
  cout << "b = c => "; b = c; cout << endl;
  
  cout << "c = a => "; c = a; cout << endl;
  cout << "c = b => "; c = b; cout << endl;
  cout << "c = c => "; c = c; cout << endl;
  
  cout << "a.hoge(a) => "; a.hoge(a); cout << endl;
  cout << "a.hoge(b) => "; a.hoge(b); cout << endl;
  cout << "a.hoge(c) => "; a.hoge(c); cout << endl;
  
  cout << "b.hoge(a) => "; b.hoge(a); cout << endl;
  cout << "b.hoge(b) => "; b.hoge(b); cout << endl;
  cout << "b.hoge(c) => "; b.hoge(c); cout << endl;
  
  cout << "c.hoge(a) => "; c.hoge(a); cout << endl;
  cout << "c.hoge(b) => "; c.hoge(b); cout << endl;
  cout << "c.hoge(c) => "; c.hoge(c); cout << endl;
}