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

fstream::swap in C++

It is used to exchanges all internal data between x and *this.

Following is the declaration for fstream::swap.

void swap (basic_fstream& x);

x − Another basic_fstream object of the same type (i.e., with the same template parameters charT and traits).

none

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

It modifies both stream objects (*this and x).

In below example explains about fstream swap function.

#include <fstream>

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

   foo.swap(bar);

   foo << "lorem ipsum";

   foo.close();

   return 0;
}

fstream.htm

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