std::basic_istream<CharT,Traits>::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 <iostream>#include <sstream>#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()<<'\n';}
Output:
hello
