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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4.  
  5. using namespace std;
  6.  
  7. namespace {
  8.  
  9. // address to number
  10. unsigned a2n(void *addr)
  11. {
  12.   static std::vector<void*> addr_list;
  13.  
  14.   unsigned i = 0;
  15.   for(; i < addr_list.size(); ++i) {
  16.     if(addr_list[i] == addr) {
  17.       return i;
  18.     }
  19.   }
  20.   addr_list.push_back(addr);
  21.   return i;
  22. }
  23.  
  24. // number to string
  25. std::string n2s(unsigned n)
  26. {
  27.   switch(n) {
  28.   case 0:
  29.     return "x";
  30.   case 1:
  31.     return "tmp";
  32.   case 2:
  33.     return "y";
  34.   default:
  35.     return "none";
  36.   }
  37. }
  38.  
  39. struct Hoge
  40. {
  41.   Hoge()
  42.   {
  43.     cout << "Hoge : default constructor. (" << n2s(a2n(this)) << ")" << endl;
  44.   }
  45.  
  46.   ~Hoge()
  47.   {
  48.     cout << "Hoge : destructor. (" << n2s(a2n(this)) << ")" << endl;
  49.   }
  50.  
  51.   Hoge(const Hoge& o)
  52.   {
  53.     cout << "Hoge : copy constructor. (" << n2s(a2n((void*)&o)) << ") -> (" << n2s(a2n(this)) << ")" << endl;
  54.   }
  55.  
  56.   Hoge(Hoge&& o)
  57.   {
  58.     cout << "Hoge : move constructor. (" << n2s(a2n((void*)&o)) << ") -> (" << n2s(a2n(this)) << ")" << endl;
  59.   }
  60.  
  61.   Hoge&& foo()
  62.   {
  63.     Hoge tmp(*this);
  64.     return std::move(tmp);
  65.   }
  66. };
  67.  
  68. } // namespace
  69.  
  70. int main()
  71. {
  72.   Hoge x;
  73.   Hoge y = x.foo();
  74. }
  75.  
Success #stdin #stdout 0s 3064KB
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Standard input is empty
stdout
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Hoge : default constructor. (x)
Hoge : copy constructor. (x) -> (tmp)
Hoge : destructor. (tmp)
Hoge : move constructor. (tmp) -> (y)
Hoge : destructor. (y)
Hoge : destructor. (x)
https://ideone.com/QTzeq
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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