std::basic_istream::swap - cppreference.com

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# std::basic_istream::swap

From cppreference.com
< cpp‎ | io‎ | basic istream

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

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.

### [edit] Parameters

rhs | - | different basic_istream object of the same type to swap with

### [edit] Example

Run this code

    #include <sstream>
    #include <iostream>
    #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();
    }

Output:

    hello

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