[text.c.strings]

28.7.1 Header <cctype> synopsis [cctype.syn]

namespace std { int isalnum(int c); int isalpha(int c); int isblank(int c); int iscntrl(int c); int isdigit(int c); int isgraph(int c); int islower(int c); int isprint(int c); int ispunct(int c); int isspace(int c); int isupper(int c); int isxdigit(int c); int tolower(int c); int toupper(int c); }

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The contents and meaning of the header are the same as the C standard library header <ctype.h>.

28.7.2 Header <cwctype> synopsis [cwctype.syn]

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namespace std { using wint_t = see below; using wctrans_t = see below; using wctype_t = see below; int iswalnum(wint_t wc); int iswalpha(wint_t wc); int iswblank(wint_t wc); int iswcntrl(wint_t wc); int iswdigit(wint_t wc); int iswgraph(wint_t wc); int iswlower(wint_t wc); int iswprint(wint_t wc); int iswpunct(wint_t wc); int iswspace(wint_t wc); int iswupper(wint_t wc); int iswxdigit(wint_t wc); int iswctype(wint_t wc, wctype_t desc); wctype_t wctype(const char* property); wint_t towlower(wint_t wc); wint_t towupper(wint_t wc); wint_t towctrans(wint_t wc, wctrans_t desc); wctrans_t wctrans(const char* property); } #define WEOF see below

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The contents and meaning of the header are the same as the C standard library header <wctype.h>.

28.7.3 Header <cwchar> synopsis [cwchar.syn]

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#define __STDC_VERSION_WCHAR_H__ 202311L namespace std { using size_t = see [support.types.layout]; // freestanding using mbstate_t = see below; // freestanding using wint_t = see below; // freestanding struct tm; int fwprintf(FILE* stream, const wchar_t* format, ...); int fwscanf(FILE* stream, const wchar_t* format, ...); int swprintf(wchar_t* s, size_t n, const wchar_t* format, ...); int swscanf(const wchar_t* s, const wchar_t* format, ...); int vfwprintf(FILE* stream, const wchar_t* format, va_list arg); int vfwscanf(FILE* stream, const wchar_t* format, va_list arg); int vswprintf(wchar_t* s, size_t n, const wchar_t* format, va_list arg); int vswscanf(const wchar_t* s, const wchar_t* format, va_list arg); int vwprintf(const wchar_t* format, va_list arg); int vwscanf(const wchar_t* format, va_list arg); int wprintf(const wchar_t* format, ...); int wscanf(const wchar_t* format, ...); wint_t fgetwc(FILE* stream); wchar_t* fgetws(wchar_t* s, int n, FILE* stream); wint_t fputwc(wchar_t c, FILE* stream); int fputws(const wchar_t* s, FILE* stream); int fwide(FILE* stream, int mode); wint_t getwc(FILE* stream); wint_t getwchar(); wint_t putwc(wchar_t c, FILE* stream); wint_t putwchar(wchar_t c); wint_t ungetwc(wint_t c, FILE* stream); double wcstod(const wchar_t* nptr, wchar_t** endptr); float wcstof(const wchar_t* nptr, wchar_t** endptr); long double wcstold(const wchar_t* nptr, wchar_t** endptr); long int wcstol(const wchar_t* nptr, wchar_t** endptr, int base); long long int wcstoll(const wchar_t* nptr, wchar_t** endptr, int base); unsigned long int wcstoul(const wchar_t* nptr, wchar_t** endptr, int base); unsigned long long int wcstoull(const wchar_t* nptr, wchar_t** endptr, int base); wchar_t* wcscpy(wchar_t* s1, const wchar_t* s2); // freestanding wchar_t* wcsncpy(wchar_t* s1, const wchar_t* s2, size_t n); // freestanding wchar_t* wmemcpy(wchar_t* s1, const wchar_t* s2, size_t n); // freestanding wchar_t* wmemmove(wchar_t* s1, const wchar_t* s2, size_t n); // freestanding wchar_t* wcscat(wchar_t* s1, const wchar_t* s2); // freestanding wchar_t* wcsncat(wchar_t* s1, const wchar_t* s2, size_t n); // freestanding int wcscmp(const wchar_t* s1, const wchar_t* s2); // freestanding int wcscoll(const wchar_t* s1, const wchar_t* s2); int wcsncmp(const wchar_t* s1, const wchar_t* s2, size_t n); // freestanding size_t wcsxfrm(wchar_t* s1, const wchar_t* s2, size_t n); int wmemcmp(const wchar_t* s1, const wchar_t* s2, size_t n); // freestanding const wchar_t* wcschr(const wchar_t* s, wchar_t c); // freestanding; see [library.c] wchar_t* wcschr(wchar_t* s, wchar_t c); // freestanding; see [library.c] size_t wcscspn(const wchar_t* s1, const wchar_t* s2); // freestanding const wchar_t* wcspbrk(const wchar_t* s1, const wchar_t* s2); // freestanding; see [library.c] wchar_t* wcspbrk(wchar_t* s1, const wchar_t* s2); // freestanding; see [library.c] const wchar_t* wcsrchr(const wchar_t* s, wchar_t c); // freestanding; see [library.c] wchar_t* wcsrchr(wchar_t* s, wchar_t c); // freestanding; see [library.c] size_t wcsspn(const wchar_t* s1, const wchar_t* s2); // freestanding const wchar_t* wcsstr(const wchar_t* s1, const wchar_t* s2); // freestanding; see [library.c] wchar_t* wcsstr(wchar_t* s1, const wchar_t* s2); // freestanding; see [library.c] wchar_t* wcstok(wchar_t* s1, const wchar_t* s2, wchar_t** ptr); // freestanding const wchar_t* wmemchr(const wchar_t* s, wchar_t c, size_t n); // freestanding; see [library.c] wchar_t* wmemchr(wchar_t* s, wchar_t c, size_t n); // freestanding; see [library.c] size_t wcslen(const wchar_t* s); // freestanding wchar_t* wmemset(wchar_t* s, wchar_t c, size_t n); // freestanding size_t wcsftime(wchar_t* s, size_t maxsize, const wchar_t* format, const tm* timeptr); wint_t btowc(int c); int wctob(wint_t c); // [c.mb.wcs], multibyte / wide string and character conversion functions int mbsinit(const mbstate_t* ps); size_t mbrlen(const char* s, size_t n, mbstate_t* ps); size_t mbrtowc(wchar_t* pwc, const char* s, size_t n, mbstate_t* ps); size_t wcrtomb(char* s, wchar_t wc, mbstate_t* ps); size_t mbsrtowcs(wchar_t* dst, const char** src, size_t len, mbstate_t* ps); size_t wcsrtombs(char* dst, const wchar_t** src, size_t len, mbstate_t* ps); } #define NULL see [support.types.nullptr] // freestanding #define WCHAR_MAX see below // freestanding #define WCHAR_MIN see below // freestanding #define WEOF see below // freestanding #define WCHAR_WIDTH see below // freestanding

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The contents and meaning of the header <cwchar> are the same as the C standard library header <wchar.h>, except that it does not declare a type wchar_t.

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[Note 1:

The functions wcschr, wcspbrk, wcsrchr, wcsstr, and wmemchr have different signatures in this document, but they have the same behavior as in the C standard library ([library.c]).

— end note]

28.7.4 Header <cuchar> synopsis [cuchar.syn]

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#define __STDC_VERSION_UCHAR_H__ 202311L 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); }

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The contents and meaning of the header are the same as the C standard library header <uchar.h>, except that it does not declare types char8_t, char16_t, or char32_t.

28.7.5 Multibyte / wide string and character conversion functions [c.mb.wcs]

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[Note 1:

The headers <cstdlib>, <cuchar>, and <cwchar> declare the functions described in this subclause.

— end note]

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int mbsinit(const mbstate_t* ps);
int mblen(const char* s, size_t n);
size_t mbstowcs(wchar_t* pwcs, const char* s, size_t n);
size_t wcstombs(char* s, const wchar_t* pwcs, size_t n);

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Effects: These functions have the semantics specified in the C standard library.

See also: ISO/IEC 9899:2024, 7.22.7.1, 7.22.8, 7.29.6.2.1

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int mbtowc(wchar_t* pwc, const char* s, size_t n);
int wctomb(char* s, wchar_t wchar);

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Effects: These functions have the semantics specified in the C standard library.

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Remarks: Calls to these functions may introduce a data race ([res.on.data.races]) with other calls to the same function.

28 Text processing library [text]

28.7 Null-terminated sequence utilities [text.c.strings]

28.7.1 Header <cctype> synopsis [cctype.syn]

28.7.2 Header <cwctype> synopsis [cwctype.syn]

28.7.3 Header <cwchar> synopsis [cwchar.syn]

28.7.4 Header <cuchar> synopsis [cuchar.syn]

28.7.5 Multibyte / wide string and character conversion functions [c.mb.wcs]