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Showing content from https://cplusplus.com/reference/unordered_set/unordered_set/swap/ below:

public member function

<unordered_set>

void swap ( unordered_set& ust );

Swap content

After the call to this member function, the elements in this container are those which were in ust before the call, and the elements of ust are those which were in this. Other objects kept internally by the containers (such as their hasher or key_equal objects) are also swapped.

This function exchanges internal pointers to data between the containers without actually performing any copies or moves on the individual elements, allowing for constant time execution no matter the sizes.

Notice that a global algorithm function exists with this same name, swap. This global function is overloaded for arguments of type unordered_set to have the same behavior and complexity as this member function.

ust

Another unordered_set container object of the same type as this.

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// unordered_set::swap
#include <iostream>
#include <string>
#include <unordered_set>

int main ()
{
  std::unordered_set<std::string>
     first = {"iron","copper","oil"},
     second  = {"wood","corn","milk"};

  first.swap(second);

  std::cout << "first:";
  for (const std::string& x: first) std::cout << " " << x;
  std::cout << std::endl;

  std::cout << "second:";
  for (const std::string& x: second) std::cout << " " << x;
  std::cout << std::endl;

  return 0;
}

first: corn milk wood
second: oil copper iron

swap (unordered_set)

Exchanges contents of two unordered_set containers (function template)

swap

Exchange values of two objects (function template)

swap_ranges

Exchange values of two ranges (function template)

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