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  1. #include <iostream>
  2. #include <string>
  3. #include <functional>
  4. #include <vector>
  5.  
  6. class Elem
  7. {
  8. private:
  9.     int value_;
  10.     std::function<void(const std::string&)> callback_;
  11.  
  12. public:
  13.     Elem(int v, std::function<void(const std::string&)> cb)
  14.         : value_{v}, callback_{cb}
  15.     {}
  16.  
  17.     void some_function() const
  18.     {
  19.         callback_("Elem with value " + std::to_string(value_));
  20.     }
  21. };
  22.  
  23. class Cont
  24. {
  25. private:
  26.     std::vector<Elem> elements_;
  27.  
  28.     void private_function(const std::string& s)
  29.     {
  30.         std::cout << "In private function: " << s << '\n';
  31.     }
  32.  
  33. public:
  34.     void add_value(const int v)
  35.     {
  36.         elements_.push_back(Elem(v, std::bind(&Cont::private_function, this, std::placeholders::_1)));
  37.     }
  38.  
  39.     std::vector<Elem>::const_iterator begin() const
  40.     {
  41.         return std::begin(elements_);
  42.     }
  43.  
  44.     std::vector<Elem>::const_iterator end() const
  45.     {
  46.         return std::end(elements_);
  47.     }
  48. };
  49.  
  50. int main()
  51. {
  52.     Cont c;
  53.  
  54.     // Add some elements
  55.     for (int i = 1; i <= 10; ++i)
  56.         c.add_value(i);
  57.  
  58.     // Call callback function
  59.     for (const auto& e : c)
  60.         e.some_function();
  61. }
  62.  
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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In private function: Elem with value 1
In private function: Elem with value 2
In private function: Elem with value 3
In private function: Elem with value 4
In private function: Elem with value 5
In private function: Elem with value 6
In private function: Elem with value 7
In private function: Elem with value 8
In private function: Elem with value 9
In private function: Elem with value 10
https://ideone.com/lh0NlD
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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