stddef.h(3HEAD) Headers stddef.h(3HEAD)
NAME
stddef.h, stddef - standard type definitions
SYNOPSIS
#include <stddef.h>
DESCRIPTION
The <stddef.h> header defines 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 defines the following types:
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 mem-
ber of the portable character set has a code value equal to its value when used as the lone character in an integer charac-
ter constant.
size_t Unsigned integer type of the result of the sizeof operator.
The implementation supports one or more programming environments in which the widths of ptrdiff_t, size_t, and wchar_t are no greater than
the width of type long. The names of these programming environments can be obtained using the confstr(3C) function or the getconf(1) util-
ity.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
getconf(1), confstr(3C), types.h(3HEAD), wchar.h(3HEAD), attributes(5), standards(5)
SunOS 5.10 10 Sep 2004 stddef.h(3HEAD)
