std::basic_ostream<CharT,Traits>::swap (3) - Linux Manuals

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

NAME

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