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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.   int a = 4, b = 5;
  7.   cout << "Before assignment: a: " << a << ", b: " << b << endl;
  8.   pair<int&, int&> ba(b, a);
  9.   ba = make_pair(a, b); // <===: (b, a) = (a, b)
  10.   cout << "After assignment : a: " << a << ", b: " << b << endl;
  11.   return 0;
  12. }
Success #stdin #stdout 0s 4472KB
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Standard input is empty
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Before assignment: a: 4, b: 5
After assignment : a: 5, b: 4
https://ideone.com/RXXG09
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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