#include <iostream>
#include <string>
#include <cstring>
 
void swapStrings(std::string& s1, std::string& s2)
{
   const int size = sizeof(std::string);
   char buffer[size];
   std::memcpy(buffer, &s1, size);
   std::memcpy(&s1, &s2, size);
   std::memcpy(&s2, buffer, size);
}
 
int main()
{
   std::string s1{"String 1"};
   std::string s2{"String 2"};
   swapStrings(s1, s2);
   std::cout << s1 << std::endl;
   std::cout << s2 << std::endl;
}
 

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