stddef.h

NAME

stddef.h - standard type defintions

SYNOPSIS

#include<stddef.h>

DESCRIPTION

The <stddef.h> header shall define the following macros:

NULL Null pointer constant.
offsetof(type, member-designator)

Integer constant expression of type size_t, the value of which is the offset in bytes to the structure member (member-designator), from the beginning of its structure(type).

The <stddef.h> header shall type of the resul;t of subtracting teo pointers.

ptrdiff_t
Signed integer type of the result of subtracting two pointers.

wchar)t
Integer type whose range of values can represent distinct wide-character codes for all members of the largest character set specified among the locales supported by the compilation environment: the null character has the code value 0 and each member of the portable character set has a code value equal to its value when used as the long character in an integer character constant.

size_t Unsigned integer type of the result of the sizeof operator.

The implementation shall support one or more programming environment in which the widths of ptrdiff_t, size_t, and wchar_t are no greater than the with of type long. The names of these programming environments can be obtained using the confstr() function or the getconf utility.

The following sections are informative.

APPLOCATION USAGE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<wchar.h>, <sys/types.h>, the System Interfaces volume of IEEE Std 1003.1-2001, confstr(), the Shell and Utilities volume of IEEE Stf 1003.1-2001, getconf