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NetBSD 6.1.5 - man page for stddef (netbsd section 3)

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STDDEF(3)			   BSD Library Functions Manual 			STDDEF(3)

NAME
     stddef -- standard type definitions

SYNOPSIS
     #include <stddef.h>

DESCRIPTION
     The <stddef.h> header defines the following types and macros:

	 1.   ptrdiff_t, a signed integer type of the result of subtracting two pointers;

	 2.   size_t, an unsigned integer type of the result of the sizeof() operator;

	 3.   wchar_t, an integer type whose range of values can represent distinct wide-charac-
	      ter codes for all members of the largest character set specified among the sup-
	      ported locales: the null character has the code value 0 and each member of the
	      character set has a code value equal to its value when used as the lone character
	      in an integer character constant;

	 4.   NULL, which expands to an implementation-defined null pointer constant; and

	 5.   offsetof(), a macro that expands to an integer constant as described in
	      offsetof(3).

     Some of the described types and macros may appear also in other headers.

SEE ALSO
     offsetof(3), stdlib(3), unistd(3)

STANDARDS
     As described here, the <stddef.h> header conforms to ISO/IEC 9899:1999 (``ISO C99'') and
     IEEE Std 1003.1-2001 (``POSIX.1'').  Some of the types and macros conform to earlier stan-
     dards such as ANSI X3.159-1989 (``ANSI C89'').

HISTORY
     In the current form the <stddef.h> header was introduced in NetBSD 0.8, the first official
     release of NetBSD.  Some definitions such as NULL were first introduced already in the
     <nsys/param.h> header of Version 4 AT&T UNIX.

BSD					  April 10, 2011				      BSD
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