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  1. #include <iostream>
  2. #include <iterator>
  3. #include <vector>
  4.  
  5. class my_iterator : public std::iterator<std::bidirectional_iterator_tag, int> {
  6.   int d_val = 12;
  7. public:
  8.   my_iterator  operator--(int) { std::cout << "decrement--\n"; return my_iterator(); }
  9.   my_iterator &operator--()    { std::cout << "--decrement\n"; return *this; }
  10.   my_iterator  operator++(int) { std::cout << "increment++\n"; return my_iterator(); }
  11.   my_iterator &operator++()    { std::cout << "++increment\n"; return *this; }
  12.  
  13.   int &operator*() { std::cout << "*dereference\n"; return d_val; }
  14.  
  15.   bool operator==(my_iterator const  &o) { return false; }
  16.   bool operator!=(my_iterator const  &o) { return true ; }
  17. };
  18.  
  19.  
  20. int main() {
  21.   auto it = std::reverse_iterator<my_iterator>();
  22.   int &i = *it;
  23.   if (true)
  24.   {
  25.     std::cout << i << '\n';
  26.   }
  27.   else
  28.   {
  29.     std::vector<int> vec;
  30.     vec.push_back(i);
  31.     std::cout << vec[0] << '\n';
  32.   }
  33. }
Runtime error #stdin #stdout 0s 3224KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/YJKvpl
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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