NAME
intptr_t, uintptr_t - integer types wide enough to hold pointers
LIBRARY
Standard C library (libc)
SYNOPSIS
#include <stdint.h>
typedef /* ... */ intptr_t; typedef /* ... */ uintptr_t;
#define INTPTR_WIDTH /* ... */ #define UINTPTR_WIDTH INTPTR_WIDTH
#define INTPTR_MAX /* 2**(INTPTR_WIDTH - 1) - 1 */ #define INTPTR_MIN /* - 2**(INTPTR_WIDTH - 1) */ #define UINTPTR_MAX /* 2**UINTPTR_WIDTH - 1 */
DESCRIPTION
intptr_t is a signed integer type such that any valid (void *) value can be converted to this type and then converted back. It is capable of storing values in the range [INTPTR_MIN, INTPTR_MAX].
uintptr_t is an unsigned integer type such that any valid (void *) value can be converted to this type and then converted back. It is capable of storing values in the range [0, UINTPTR_MAX].
The macros [U]INTPTR_WIDTH expand to the width in bits of these types.
The macros [U]INTPTR_MAX expand to the maximum value that these types can hold.
The macro INTPTR_MIN expands to the minimum value that intptr_t can hold.
The length modifiers for the [u]intptr_t types for the printf(3) family of functions are expanded by the macros PRIdPTR, PRIiPTR, and PRIuPTR (defined in <inttypes.h>); resulting commonly in %"PRIdPTR" or %"PRIiPTR" for printing intptr_t values. The length modifiers for the [u]intptr_t types for the scanf(3) family of functions are expanded by the macros SCNdPTR, SCNiPTR, and SCNuPTR (defined in <inttypes.h>); resulting commonly in %"SCNuPTR" for scanning uintptr_t values.
STANDARDS
- [u]intptr_t
[U]INTPTR_MAX
INTPTR_MIN -
C23, POSIX.1-2024.
- [U]INTPTR_WIDTH
-
C23.
HISTORY
- [u]intptr_t
-
SUSv2, C99, POSIX.1-2001 XSI.
- [U]INTPTR_MAX
INTPTR_MIN -
C99, POSIX.1-2001 XSI.
- [U]INTPTR_WIDTH
-
C23.
NOTES
The following header also provides these types: <inttypes.h>.