23 Strings library [strings]

23.5 Null-terminated sequence utilities [c.strings]

23.5.5 Header <cuchar> synopsis [cuchar.syn]

namespace std { using mbstate_t = see below; using size_t = see [support.types.layout]; size_t mbrtoc8(char8_t* pc8, const char* s, size_t n, mbstate_t* ps); size_t c8rtomb(char* s, char8_t c8, mbstate_t* ps); size_t mbrtoc16(char16_t* pc16, const char* s, size_t n, mbstate_t* ps); size_t c16rtomb(char* s, char16_t c16, mbstate_t* ps); size_t mbrtoc32(char32_t* pc32, const char* s, size_t n, mbstate_t* ps); size_t c32rtomb(char* s, char32_t c32, mbstate_t* ps); }

The contents and meaning of the header are the same as the C standard library header <uchar.h>, except that it declares the additional mbrtoc8 and c8rtomb functions and does not declare types char16_t nor char32_t.