NAME

std::basic_ostream::swap - std::basic_ostream::swap

Synopsis

protected: (since C++11)
void swap(basic_ostream& rhs);

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

rhs - a basic_ostream of the same type to swap with

Example

// Run this code

#include <sstream>
#include <iostream>
#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';
}

Output:

hello