protected member function
<ios> <iostream>
void swap (basic_ios& x) noexcept;
Swap internals
Exchanges all internal members between x and *this, except the pointers to the associated stream buffers: rdbuf shall return the same in both objects as before the call.
Derived classes can call this function to implement custom swap functions.
Parameters
- x
- Another stream object of the same type.
Data races
Modifies both stream objects (*this and x).
Exception safety
No-throw guarantee: this member function never throws exceptions.