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  1. #include <algorithm>
  2. #include <functional>
  3. #include <iostream>
  4.  
  5. class A
  6. {
  7.     std::reference_wrapper<int> r;
  8. public:
  9.    A(int& v) : r(v) {}
  10.    void swap(A& rhs)
  11.    {
  12.       std::swap(r, rhs.r);
  13.    }
  14.  
  15.    int& get() const { return r; }
  16. };
  17.  
  18. int main()
  19. {
  20.     int i = 42;
  21.     int j = 0;
  22.     A a(i), b(j);
  23.  
  24.     a.swap(b);
  25.     ++j;
  26.     std::cout << j << "==" << a.get() << std::endl;
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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1==1
https://ideone.com/arpLMc
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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