std::ios_base::imbue
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   std::locale imbue( const std::locale& loc );  | 
||
Sets the associated locale of the stream to the given one. Before returning, each function, registered by register_callback() is called with imbue_event as a parameter. 
Parameters
| loc | - | new locale to associate the stream to | 
Return value
The locale object associated with the stream before the operation
Example
| This section is incomplete Reason: no example  | 
See also
|    returns current locale   (public member function)  |