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

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

Parameters

Example

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

hello