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 STDDEF.H 3HEAD "Sep 10, 2004"
 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 member of the portable character set has a code value equal to its
value when used as the lone character in an integer character 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)
utility.

 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)