Standard library header <cuchar>
From cppreference.com
                    
                                        
                    
                    
                                                            
                    This header was originally in the C standard library as <uchar.h>.
This header is part of the null-terminated multibyte strings library.
| Macros | |
| __STDC_UTF_16__ | indicates that UTF-16 encoding is used by mbrtoc16 and c16rtomb (macro constant) | 
| __STDC_UTF_32__ | indicates that UTF-32 encoding is used by mbrtoc32 and c32rtomb (macro constant) | 
| Functions | |
| (C++11) | generate the next 16-bit wide character from a narrow multibyte string (function) | 
| (C++11) | convert a 16-bit wide character to narrow multibyte string (function) | 
| (C++11) | generate the next 32-bit wide character from a narrow multibyte string (function) | 
| (C++11) | convert a 32-bit wide character to narrow multibyte string (function) | 


