std::basic_ostringstream::rdbuf
From cppreference.com
                    
                                        
                    < cpp | io | basic ostringstream
                    
                                                            
                    
| std::basic_stringbuf<CharT, Traits, Allocator>* rdbuf() const; | ||
Returns pointer to the underlying raw string device object.
Parameters
(none)
Return value
Pointer to the underlying raw string device.
Example
| This section is incomplete Reason: no example |