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  1. #include <iostream>
  2. #include <algorithm>
  3.  
  4. namespace foo
  5. {
  6.     struct Bar
  7.     {
  8.         int data;
  9.     };
  10.  
  11.     void swap(Bar& a, Bar& b)
  12.     {
  13.         std::cout << "foo::swap" << std::endl;
  14.  
  15.         int temp = a.data;
  16.         a.data = b.data;
  17.         b.data = temp;
  18.     }
  19. }
  20.  
  21. int main()
  22. {
  23.     foo::Bar bar1, bar2;
  24.  
  25.     bar1.data = 42;
  26.     bar2.data = 777;
  27.  
  28.     std::cout << bar1.data << ' ' << bar2.data << std::endl;
  29.  
  30.     using std::swap;
  31.     swap(bar1, bar2); // Call foo::swap not std::swap.
  32.  
  33.     std::cout << bar1.data << ' ' << bar2.data << std::endl;
  34.  
  35.     return 0;
  36. }
Success #stdin #stdout 0s 4328KB
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stdin
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Standard input is empty
stdout
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42 777
foo::swap
777 42
https://ideone.com/K4UAzr
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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