disable copy and assign in C++98 and C++11

disable_copy_and_assign_cpp11.cc

// g++ -std=c++11

class NonCopyable {
 public:
  NonCopyable() = default;
  NonCopyable(const NonCopyable&) = delete;
  void operator=(const NonCopyable&) = delete;
 private:
  friend class A;
};

class A {
 public:
  void f() {
    NonCopyable a;
    NonCopyable b(a); // error
  }

  void g() {
    NonCopyable a;
    NonCopyable b = a; // error
  }
};

int main() {
  {
    NonCopyable a;
    //    NonCopyable b(a); // error
  }

  {
    NonCopyable a;
    //    NonCopyable b = a; // error
  }

  // {
  //   A a;
  //   a.f();
  //   a.g();
  // }
  return 0;
}

disable_copy_and_assign_cpp98.cc

class NonCopyable {
 public:
  NonCopyable() {}
 private:
  friend class A;

  NonCopyable(const NonCopyable&);
  void operator=(const NonCopyable&);
};

class A {
 public:
  void f() {
    NonCopyable a;
    NonCopyable b(a);
  }

  void g() {
    NonCopyable a;
    NonCopyable b = a;
  }
};

int main() {
  {
    NonCopyable a;
    //    NonCopyable b(a); // error
  }

  {
    NonCopyable a;
    //    NonCopyable b = a; // error
  }

  {
    A a;
    a.f();
    a.g();
  }

  return 0;
}