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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_fstream_swap_free.htm below:

C++ fstream swap Function

It exchanges the values of the fstream objects x and y.

Following is the declaration for fstream::swap.

template <class charT, class traits>
  void swap (basic_fstream<charT,traits>& x, basic_fstream<charT,traits>& y);

• x,y − basic_fstream objects of the same type (i.e., having both the same template parameters, charT and traits).

none

No-throw guarantee − this member function never throws exceptions.

Both objects, x and y, are modified.

In below example explains about fstream swap function.

#include <fstream>

int main () {
   std::fstream foo;
   std::fstream bar ("test.txt");

   swap(foo,bar);

   foo << "tutorialspoint";

   foo.close();

   return 0;
}

fstream.htm

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