?? stddef.h
字號(hào):
#pragma force_top_level
#pragma include_only_once
/* stddef.h: ANSI 'C' (X3J11 Oct 88) library header, section 4.1.4 */
/* Copyright (C) Codemist Ltd., 1988 */
/* Copyright (C) Advanced Risc Machines Ltd., 1991 */
/* version 0.05 */
/*
* The following types and macros are defined in several headers referred to in
* the descriptions of the functions declared in that header. They are also
* defined in this header file.
*/
#ifndef __stddef_h
#define __stddef_h
typedef int ptrdiff_t;
#ifndef __STDC__
# define ptrdiff_t int /* ANSI bans this -- delete unless pcc wants. */
/* the signed integral type of the result of subtracting two pointers. */
#endif
#ifndef __size_t
# define __size_t 1
typedef unsigned int size_t; /* others (e.g. <stdio.h>) define */
/* the unsigned integral type of the result of the sizeof operator. */
#endif
#ifndef __wchar_t
# define __wchar_t 1
typedef int wchar_t; /* also in <stdlib.h> */
/*
* An integral type whose range of values can represent distinct codes for
* all members of the largest extended character set specified among the
* supported locales; the null character shall have the code value zero and
* each member of the basic character set shall have a code value when used
* as the lone character in an integer character constant.
*/
#endif
#ifndef NULL /* this hack is so that <stdio.h> can also define it */
# define NULL 0
/* null pointer constant. */
#endif
#define offsetof(type, member) \
((size_t)((char *)&(((___type type *)0)->member) - (char *)0))
/*
* expands to an integral constant expression that has type size_t, the
* value of which is the offset in bytes, from the beginning of a structure
* designated by type, of the member designated by the identifier (if the
* specified member is a bit-field, the behaviour is undefined).
*/
#endif
/* end of stddef.h */
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