std::basic_istream<CharT,Traits>:: swap

Calls basic_ios :: swap ( rhs ) to swap all data members of the base class except for rdbuf() , and swaps the values of the gcount() counters between * this and rhs . This swap function is protected: it is called by the swap functions of the swappable input stream classes std::basic_ifstream and std::basic_istringstream , which know how to correctly swap the associated streambuffers.

Parameters

Example

#include <iostream>
#include <sstream>
#include <utility>
int main()
{
    std::istringstream s1("hello");
    std::istringstream s2("bye");
    s1.swap(s2); // OK, istringstream has a public swap()
    std::swap(s1, s2); // OK, calls s1.swap(s2)
//  std::cin.swap(s2); // ERROR: swap is a protected member
    std::cout << s1.rdbuf() << '\n';
}

hello