STL containers with reference to objects [duplicate]

If you know what you’re doing, you can make a vector of references using std::reference_wrapper:

#include <functional>
#include <vector>

int main()
  std::vector<std::reference_wrapper<int>> iv;

  int a = 12;
  iv.push_back(a);  // or std::ref(a)

  // now iv = { 12 };

  a = 13;

  // now iv = { 13 };

Note of course that any of this will come crashing down on you if any of the referred-to variables go out of scope while you’re still holding references to them.

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