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.
rhs | - | a basic_ostream of the same type to swap with |
#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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