is size_t a keyword or a macro defination?

[Guo Congbin]

·¢¼þÈË: "Guo Congbin" <guocongbin@sei .buaa.edu.cn>
Ö÷Ìâ: is size_t a keyword?or a macro?
ÈÕÆÚ: 2004Äê6ÔÂ17ÈÕ 23:04

if size_t is a macro, where is the defination? i look it up in the stddef.h,
but i find nothing about size_t.

this is the content of stddef.h of my system,
#ifndef _LINUX_STDDEF_H
#define _LINUX_STDDEF_H

#undef NULL
#if defined(__cplus plus)
#define NULL 0
#else
#define NULL ((void *)0)
#endif

#undef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

#endif

i regard the size_t as unsigned int or unsigned long, and i am not very
confidence.

Please help me!

yours Guocongbin
2004.6.17

[P.J. Plauger]

Re: is size_t a keyword or a macro defination?

"Guo Congbin" <guocongbin@sei .buaa.edu.cn> wrote in message
news:casca7$raj $1@mail.cn99.co m...
[color=blue]
> ·¢¼þÈË: "Guo Congbin" <guocongbin@sei .buaa.edu.cn>
> Ö÷Ìâ: is size_t a keyword?or a macro?
> ÈÕÆÚ: 2004Äê6ÔÂ17ÈÕ 23:04
>
> if size_t is a macro, where is the defination? i look it up in the[/color]
stddef.h,[color=blue]
> but i find nothing about size_t.
>
> this is the content of stddef.h of my system,
> #ifndef _LINUX_STDDEF_H
> #define _LINUX_STDDEF_H
>
> #undef NULL
> #if defined(__cplus plus)
> #define NULL 0
> #else
> #define NULL ((void *)0)
> #endif
>
> #undef offsetof
> #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
>
> #endif
>
> i regard the size_t as unsigned int or unsigned long, and i am not very
> confidence.[/color]

size_t *should* be defined in <stddef.h>, and several other headers,
as a type (with a typedef).

P.J. Plauger
Dinkumware, Ltd.

http://www.dinkumware.com

[Pete Becker]

Re: is size_t a keyword or a macro defination?

Guo Congbin wrote:[color=blue]
>
> this is the content of stddef.h of my system,
> #ifndef _LINUX_STDDEF_H
> #define _LINUX_STDDEF_H
>[/color]

That's an internal header, used, I think, when building the Linux
kernel. Look for the stddef.h that comes with your compiler. On my Linux
system it's in /usr/lib/gcc-lib/i386-redhat-linux/2.96/include.

--

Pete Becker
Dinkumware, Ltd. (http://www.dinkumware.com)

[Ioannis Vranos]

Re: is size_t a keyword or a macro defination?

Guo Congbin wrote:
[color=blue]
> ·¢¼þÈË: "Guo Congbin" <guocongbin@sei .buaa.edu.cn>
> Ö÷Ìâ: is size_t a keyword?or a macro?
> ÈÕÆÚ: 2004Äê6ÔÂ17ÈÕ 23:04
>
> if size_t is a macro, where is the defination? i look it up in the stddef.h,
> but i find nothing about size_t.
>
> this is the content of stddef.h of my system,
> #ifndef _LINUX_STDDEF_H
> #define _LINUX_STDDEF_H
>
> #undef NULL
> #if defined(__cplus plus)
> #define NULL 0
> #else
> #define NULL ((void *)0)
> #endif
>
> #undef offsetof
> #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
>
> #endif
>
> i regard the size_t as unsigned int or unsigned long, and i am not very
> confidence.
>
> Please help me!
>
> yours Guocongbin
> 2004.6.17
>
>
>[/color]



In C++ size_t is a typedef of a built in unsigned integral type defined
in <cstddef>.






Best regards,

Ioannis Vranos

[Ioannis Vranos]

Re: is size_t a keyword or a macro defination?

Ioannis Vranos wrote:
[color=blue]
> In C++ size_t is a typedef of a built in unsigned integral type[/color]

and is
[color=blue]
> defined
> in <cstddef>.[/color]






Best regards,

Ioannis Vranos