std::basic_ostream<CharT,Traits>::swap
From cppreference.com
< cpp | io | basic ostream
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Input/output library
Print functions (C++23)
Buffers
(C++23)
(C++98/26*)
(C++20)
Streams
Abstractions
File I/O
String I/O
Array I/O
(C++23)
(C++23)
(C++23)
(C++98/26*)
(C++98/26*)
(C++98/26*)
Synchronized Output
(C++20)
Types
Error category interface
(C++11)
(C++11)
std::basic_ostream
Global objects
Member functions
(C++11)
Formatted output
Unformatted output
Positioning
Miscellaneous
basic_ostream::swap
(C++11)
Member classes
Non-member functions
(C++23)
(C++23)
(C++23)
(C++23)
protected:
void swap( basic_ostream& rhs );
(since C++11)
void swap( basic_ostream& rhs );
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.
[edit] Parameters
rhs
-
a basic_ostream of the same type to swap with
[edit] Example
Run this code
#include <iostream> #include <sstream> #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