char32_t

C

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Atomic operations (C11)

Thread support (C11)

Technical Specifications

Strings library

Byte strings

Multibyte strings

Wide strings

Null-terminated multibyte strings

Wide/multibyte conversions
mbsinit (C95)
mbtowc mbstowcsmbstowcs_s (C11) btowc (C95) mbrtowc (C95) mbsrtowcsmbsrtowcs_s (C95)(C11) mbrtoc16 (C11) c16rtomb (C11) c32rtomb (C11) mbrtoc32 (C11)	mblen wctombwctomb_s (C11) wcstombswcstombs_s (C11) wctob (C95) wcrtombwcrtomb_s (C95)(C11) wcsrtombswcsrtombs_s (C95)(C11) mbrlen (C95)
Types
mbstate_t (C95)

Defined in header <uchar.h>
typedef uint_least32_t char32_t;		(since C11)
Defined in header <stdint.h>
typedef /*implementation-defined*/ uint_least32_t;		(since C99)

char32_t is an unsigned integer type used for 32-bit wide characters and is the same type as uint_least32_t.

uint_least32_t is the smallest unsigned integer type with width of at least 32 bits.

Notes

On any given platform, the width of type char32_t can be greater than 32 bits, but the actual values stored in an object of type char32_t will always have a width of 32 bits.

Example

Run this code

#include <uchar.h>
#include <stdio.h>

int main(void)
{
    char32_t wc[] = U"z"; // or "z\u00df\u6c34\U0001f34c"
    size_t wc_sz = sizeof wc / sizeof *wc;
    printf("%zu UTF-32 code units: [ ", wc_sz);
    for (size_t n = 0; n < wc_sz; ++n) printf("%#x ", wc[n]);
    printf("]\n");
}

Possible output:

5 UTF-32 code units: [ 0x7a 0xdf 0x6c34 0x1f34c 0 ]

References

• C11 standard (ISO/IEC 9899:2011):

• 7.28 Unicode utilities <uchar.h> (p: 398)

• 7.20.1.2 Minimum-width integer types (p: 290)

• C99 standard (ISO/IEC 9899:1999):

• 7.18.1.2 Minimum-width integer types (p: 256)

See also