Standard library header <codectv>
From cppreference.com
                    
                                        
                    
                    
                                                            
                    This header is part of the localization library.
[edit] Definitions
| (C++11) | converts between UTF-8 and UCS2/UCS4 (class template) | 
| (C++11) | converts between UTF-16 and UCS2/UCS4 (class template) | 
| (C++11) | converts between UTF-8 and UTF-16 (class template) | 
| (C++11) | tags to alter behavior of the standard codecvt facets (enum) | 
[edit] Synopsis
namespace std { enum codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 }; template<class Elem, unsigned long Maxcode = 0x10ffff, codecvt_mode Mode = (codecvt_mode)0> class codecvt_utf8 : public codecvt<Elem, char, mbstate_t> { // unspecified }; template<class Elem, unsigned long Maxcode = 0x10ffff, codecvt_mode Mode = (codecvt_mode)0> class codecvt_utf16 : public codecvt<Elem, char, mbstate_t> { // unspecified }; template<class Elem, unsigned long Maxcode = 0x10ffff, codecvt_mode Mode = (codecvt_mode)0> class codecvt_utf8_utf16 : public codecvt<Elem, char, mbstate_t> { // unspecified }; }