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  1. #include <iostream>
  2.  
  3. class A
  4. {
  5.     int a;
  6.  
  7. protected:
  8.     explicit A(int x): a(x)     { std::cout << "A::A(int)"      << std::endl; }
  9.  
  10. public:
  11.     A(): a(0)                   { std::cout << "A::A()"         << std::endl; }
  12.     A(const A &copy): a(copy.a) { std::cout << "A::A(const A&)" << std::endl; }
  13.  
  14.     int data() const            { return a; }
  15. };
  16.  
  17. class B: public A
  18. {
  19.     int b;
  20. public:
  21.     B(): A(1), b(123) {}
  22.     int get() const   { return b; }
  23. };
  24.  
  25. class C: public A
  26. {
  27.     int c;
  28. public:
  29.     C(): A(2), c(321) {}
  30.     int get() const   { return c; }
  31. };
  32.  
  33. int main()
  34. {
  35.     B b;
  36.     C c;
  37.  
  38.     static_cast<A&>(b) = c;
  39.     std::cout << b.data() << '\t' << b.get() << std::endl;
  40. }
  41.  
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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A::A(int)
A::A(int)
2	123
https://ideone.com/x2fsy7
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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