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  1. #include <algorithm>
  2. #include <functional>
  3. #include <iostream>
  4. #include <vector>
  5.  
  6. struct A
  7. {
  8.     A(std::initializer_list<int> il) : _values(il) {}
  9.  
  10.     std::vector<int>& get_values() { return _values; }
  11.  
  12. private:
  13.     std::vector<int> _values;
  14. };
  15.  
  16. struct B
  17. {
  18.     B(A* a) : _a(a) {}
  19.  
  20.     void apply_filter(std::function<bool(int)> filter)
  21.     {
  22.         std::vector<int>& v = _a->get_values();
  23.  
  24.         v.erase(std::remove_if(v.begin(), v.end(), filter), v.end());
  25.     }
  26.  
  27. private:
  28.     A* _a;
  29. };
  30.  
  31. void print(const std::vector<int>& v)
  32. {
  33.     std::cout << "{ ";
  34.     for (auto e : v)
  35.         std::cout << e << ' ';
  36.     std::cout << "}\n";
  37. }
  38.  
  39. int main()
  40. {
  41.     A a({ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 });
  42.     print(a.get_values());
  43.  
  44.     B b(&a);
  45.     b.apply_filter([](int val) { return val % 2 == 0; });
  46.  
  47.     print(a.get_values());
  48. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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{ 1 2 3 4 5 6 7 8 9 10 }
{ 1 3 5 7 9 }
https://ideone.com/P2KvDm
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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