# std::basic_ostream::swap

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< cpp‎ | io‎ | basic ostream

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

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

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