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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <string>
  4.  
  5. class B
  6. {
  7. public:
  8.     B ();
  9.     B (const B& other);
  10.     B (B &&other);
  11.     ~B ();
  12.  
  13. private:
  14.     int id;
  15.     static int current;
  16.  
  17.     friend std::ostream &operator<< (std::ostream &, const B&);
  18. };
  19.  
  20. int B::current = 0;
  21.  
  22. std::ostream &operator<< (std::ostream &out, const B& b)
  23. {
  24.     return out << "B" << b.id;
  25. }
  26.  
  27. B::B (B &&other) : id (current++)
  28. {
  29.     std::cout << other << "=>" << *this << "*" << std::endl;
  30. }
  31.  
  32. B::B (const B& other) : id (current++)
  33. {
  34.     std::cout << *this << "(" << other << ")" << std::endl;
  35. }
  36.  
  37. B::B () : id (current++)
  38. {
  39.     std::cout << *this << "*" << std::endl;;
  40. }
  41.  
  42. B::~B ()
  43. {
  44.     std::cout << *this << "~" << std::endl;
  45. }
  46.  
  47. B func (bool flag)
  48. {
  49.     B t, f;
  50.  
  51.     std::cout << "func(" << std::boolalpha << flag << ")" << std::endl;
  52.  
  53.     return flag ? t : f;
  54. }
  55.  
  56. int main ()
  57. {
  58.     B b1 = func (true);
  59.     std::cout << "main" << std::endl;
  60.  
  61.     return 0;
  62. }
  63.  
Success #stdin #stdout 0s 2900KB
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stdin
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Standard input is empty
stdout
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B0*
B1*
func(true)
B2(B0)
B1~
B0~
main
B2~
https://ideone.com/zoeixm
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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