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  1. #include <iostream>
  2.  
  3. class A
  4. {
  5.    int& r_;
  6. public:
  7.    A(int& v) : r_(v) {}
  8.    int& get() { return r_; }
  9.    void operator=(const A& a)
  10.    {
  11.       new(this)A(a.r_);
  12.    }
  13. };
  14.  
  15. class B : public A
  16. {
  17.    char c_;
  18. public:
  19.    B(int& v, char c) : A(v), c_(c) {}
  20.    char getch() const { return c_; }
  21.    void operator=(const B& b)
  22.    {
  23.       A::operator=((A&)b);
  24.       c_ = b.c_;
  25.    }
  26. };
  27.  
  28. void test()
  29. {
  30.    int x = 10;
  31.    int y = 20;
  32.    B d(x,'#');
  33.    B e(y, '!');
  34.    d = e;
  35.    ++y;
  36.    std::cout << "x=" << x << "\n"
  37.              << "y=" << y << "\n";
  38.    std::cout << "d.get()=" << d.get()
  39.      << ", d.getch()=" << d.getch() << "\n"
  40.      << "e.get()=" << e.get()
  41.      << ", e.getch()=" << e.getch() << "\n";
  42. }
  43.  
  44. int main(int argc, char *argv[])
  45. {
  46.    test();
  47.    return 0;
  48. }
  49.  
Success #stdin #stdout 0s 3344KB
comments (?)
stdin
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Standard input is empty
stdout
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x=10
y=21
d.get()=21, d.getch()=!
e.get()=21, e.getch()=!
https://ideone.com/bGcdxP
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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