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std::c8rtomb(3) C++ Standard Libary std::c8rtomb(3) NAME std::c8rtomb - std::c8rtomb Synopsis Defined in header <cuchar> std::size_t c8rtomb( char* s, char8_t c8, std::mbstate_t* ps ); (since C++20) Converts a single code point from UTF-8 to a narrow multibyte char- acter representation. If s is not a null pointer and c8 is the last code unit in a valid UTF-8 encoding of a code point, the function determines the number of bytes necessary to store the multibyte character representation of that code point (including any shift sequences, and taking into account the current multibyte conversion state *ps), and stores the multibyte character representation in the character array whose first element is pointed to by s, updating *ps as necessary. At most MB_CUR_MAX bytes can be written by this function. If c8 is not the final UTF-8 code unit in a representation of a code point, the function does not write to the array pointed to by s, only *ps is updated. If s is a null pointer, the call is equivalent to std::c8rtomb(buf, u8'\0', ps) for some internal buffer buf. If c8 is the null character u8'\0', a null byte is stored, preceded by any shift sequence necessary to restore the initial shift state and the con- version state parameter *ps is updated to represent the initial shift state. The multibyte encoding used by this function is specified by the currently active C locale. Parameters s - pointer to narrow character array where the multibyte character will be stored c8 - the UTF-8 code unit to convert ps - pointer to the conversion state object used when interpreting the multibyte string Return value The number of bytes stored in the array object (including any shift sequences). This may be zero when c8 is not the final code unit in the UTF-8 repre- sentation of a code point. If c8 is invalid (does not contribute to a sequence of char8_t cor- responding to a valid multibyte character), the value of the macro EILSEQ is stored in errno, static_cast<std::size_t>(-1) is returned, and the conversion state is unspecified. Notes Calls to c8rtomb with a null pointer argument for s may introduce a data race with other calls to c8rtomb with a null pointer argument for s. Example This section is incomplete Reason: no example See also mbrtoc8 converts a narrow multibyte character to UTF-8 encoding (C++20) (function) http://cppreference.com 2022.07.31 std::c8rtomb(3)
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