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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