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[diff.library]
C.4 C standard library [diff.library]
This subclause summarizes the contents of the C++ standard library included from the Standard C library. It also summarizes the explicit changes in definitions, declarations, or behavior from the Standard C library noted in other subclauses ([headers], [support.types], [c.strings]).
The header names (enclosed in < and >) indicate that the macro may be defined in more than one header. All such definitions are equivalent ([basic.def.odr]).
Table
150
— Standard macros
assert HUGE_VAL NULL <cstring> SIGINT va_end BUFSIZ LC_ALL NULL <ctime> SIGSEGV va_start CLOCKS_PER_SEC LC_COLLATE NULL <cwchar> SIGTERM WCHAR_MAX EDOM LC_CTYPE offsetof SIG_DFL WCHAR_MIN EILSEQ LC_MONETARY RAND_MAX SIG_ERR WEOF <cwchar> EOF LC_NUMERIC SEEK_CUR SIG_IGN WEOF <cwctype> ERANGE LC_TIME SEEK_END stderr _IOFBF errno L_tmpnam SEEK_SET stdin _IOLBF EXIT_FAILURE MB_CUR_MAX setjmp stdout _IONBF EXIT_SUCCESS NULL <clocale> SIGABRT TMP_MAX FILENAME_MAX NULL <cstddef> SIGFPE va_arg FOPEN_MAX NULL <cstdlib> SIGILL va_copy
The C++ standard library provides 57 standard values from the C library, as shown in Table [tab:diff.standard.values].
Table
151
— Standard values
CHAR_BIT FLT_DIG INT_MIN MB_LEN_MAX CHAR_MAX FLT_EPSILON LDBL_DIG SCHAR_MAX CHAR_MIN FLT_MANT_DIG LDBL_EPSILON SCHAR_MIN DBL_DIG FLT_MAX LDBL_MANT_DIG SHRT_MAX DBL_EPSILON FLT_MAX_10_EXP LDBL_MAX SHRT_MIN DBL_MANT_DIG FLT_MAX_EXP LDBL_MAX_10_EXP UCHAR_MAX DBL_MAX FLT_MIN LDBL_MAX_EXP UINT_MAX DBL_MAX_10_EXP FLT_MIN_10_EXP LDBL_MIN ULONG_MAX DBL_MAX_EXP FLT_MIN_EXP LDBL_MIN_10_EXP USHRT_MAX DBL_MIN FLT_RADIX LDBL_MIN_EXP DBL_MIN_10_EXP FLT_ROUNDS LONG_MAX DBL_MIN_EXP INT_MAX LONG_MIN
The C++ standard library provides 20 standard types from the C library, as shown in Table [tab:diff.standard.types].
Table
152
— Standard types
clock_t ldiv_t size_t <cstdio> va_list div_t mbstate_t size_t <cstdlib> wctrans_t FILE ptrdiff_t size_t <cstring> wctype_t fpos_t sig_atomic_t size_t <ctime> wint_t <cwchar> jmp_buf size_t <cstddef> time_t wint_t <cwctype>
The C++ standard library provides 209 standard functions from the C library, as shown in Table [tab:diff.standard.functions].
Table
154
— Standard functions
abort fmod iswalnum modf strlen wcscat abs fopen iswalpha perror strncat wcschr acos fprintf iswcntrl pow strncmp wcscmp asctime fputc iswctype printf strncpy wcscoll asin fputs iswdigit putc strpbrk wcscpy atan fputwc iswgraph putchar strrchr wcscspn atan2 fputws iswlower puts strspn wcsftime atexit fread iswprint putwc strstr wcslen atof free iswpunct putwchar strtod wcsncat atoi freopen iswspace qsort strtok wcsncmp atol frexp iswupper raise strtol wcsncpy bsearch fscanf iswxdigit rand strtoul wcspbrk btowc fseek isxdigit realloc strxfrm wcsrchr calloc fsetpos labs remove swprintf wcsrtombs ceil ftell ldexp rename swscanf wcsspn clearerr fwide ldiv rewind system wcsstr clock fwprintf localeconv scanf tan wcstod cos fwrite localtime setbuf tanh wcstok cosh fwscanf log setlocale time wcstol ctime getc log10 setvbuf tmpfile wcstombs difftime getchar longjmp signal tmpnam wcstoul div getenv malloc sin tolower wcsxfrm exit getwc mblen sinh toupper wctob exp getwchar mbrlen sprintf towctrans wctomb fabs gmtime mbrtowc sqrt towlower wctrans fclose isalnum mbsinit srand towupper wctype feof isalpha mbsrtowcs sscanf ungetc wmemchr ferror iscntrl mbstowcs strcat ungetwc wmemcmp fflush isdigit mbtowc strchr vfprintf wmemcpy fgetc isgraph memchr strcmp vfwprintf wmemmove fgetpos islower memcmp strcoll vprintf wmemset fgets isprint memcpy strcpy vsprintf wprintf fgetwc ispunct memmove strcspn vswprintf wscanf fgetws isspace memset strerror vwprintf floor isupper mktime strftime wcrtomb C.4.2 Modifications to definitions [diff.mods.to.definitions] C.4.2.1 Types char16_t and char32_t [diff.char16]
The types char16_t and char32_t are distinct types rather than typedefs to existing integral types.
C.4.2.4 Macro NULL [diff.null]
The macro NULL, defined in any of <clocale>, <cstddef>, <cstdio>, <cstdlib>, <cstring>, <ctime>, or <cwchar>, is an implementation-defined C++ null pointer constant in this International Standard ([support.types]).
C.4.4 Modifications to behavior [diff.mods.to.behavior]
Header <cstdlib>: The following functions have different behavior:
[support.start.term] describes the changes.
Header <csetjmp>: The following functions have different behavior:
[support.runtime] describes the changes.
C.4.4.1 Macro offsetof(type, member-designator) [diff.offsetof]
The macro offsetof, defined in <cstddef>, accepts a restricted set of type arguments in this International Standard. [support.types] describes the change.
C.4.4.2 Memory allocation functions [diff.malloc]
The functions calloc, malloc, and realloc are restricted in this International Standard. [c.malloc] describes the changes.
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