std::ios_base::ios_base (3) Linux Manual Page

std::ios_base::~ios_base – std::ios_base::~ios_base

Synopsis

virtual ~ios_base();

Destroys the ios_base object.
Before any of the member functions would yield undefined results, calls callbacks, registered by register_callback() passing erase_event as parameter.
No operations on rdbuf are performed, it is not destroyed.