Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #17932 > unrolled thread

Macro still floating above my head

Back to article view | Back to comp.lang.c

Contents

  Macro still floating above my head janus <emekamicro@gmail.com> - 2012-02-25 08:02 -0800
    Re: Macro still floating above my head Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-02-25 11:26 -0500
      Re: Macro still floating above my head China Blue Sea <chine.bleu@yahoo.com> - 2012-02-25 08:47 -0800
    Re: Macro still floating above my head 88888 Dihedral <dihedral88888@googlemail.com> - 2012-02-25 10:18 -0800

#17932 — Macro still floating above my head

Hello All,

I would need some to explain the below code.
#define RF_ARG16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) _15

I understand "..." as variable arguments. But what is "_x"?

Regards, \Janus

[toc] | [next] | [standalone]

#17933

On 2/25/2012 11:02 AM, janus wrote:
> Hello All,
>
> I would need some to explain the below code.
> #define RF_ARG16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) _15
>
> I understand "..." as variable arguments. But what is "_x"?

     A name for a macro parameter.  The macro is equivalent to

	#define RF_ARG16(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, \
	                 p10, p11, p12, p13, p14, p15, ...) p15

or to

	#define RF_ARG16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,...) p

     In any guise, it looks like a symptom of macro overreach if
not outright macro abuse.

-- 
Eric Sosman
esosman@ieee-dot-org.invalid

[toc] | [prev] | [next] | [standalone]

#17936

In article <jib241$5b3$1@dont-email.me>,
 Eric Sosman <esosman@ieee-dot-org.invalid> wrote:

> On 2/25/2012 11:02 AM, janus wrote:
> > Hello All,
> >
> > I would need some to explain the below code.
> > #define RF_ARG16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, 
> > #_13, _14, _15, ...) _15
> >
> > I understand "..." as variable arguments. But what is "_x"?
> 
>      A name for a macro parameter.  The macro is equivalent to
> 
> 	#define RF_ARG16(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, \
> 	                 p10, p11, p12, p13, p14, p15, ...) p15
> 
> or to
> 
> 	#define RF_ARG16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,...) p
> 
>      In any guise, it looks like a symptom of macro overreach if
> not outright macro abuse.

Your expansion says no no no,
but your parameters say yes yes yes.

-- 
My name Indigo Montoya.      |    R'lyeh 38o57'6.5''S 102o51'16''E.
You flamed my father.        |       I'm whoever you want me to be.
Prepare to be spanked.       |  Annoying Usenet one post at a time.
Stop posting that!           |    At least I can stay in character.

[toc] | [prev] | [next] | [standalone]

#17941

在 2012年2月26日星期日UTC+8上午12时02分47秒，janus写道：
> Hello All,
> 
> I would need some to explain the below code.
> #define RF_ARG16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) _15
> 
> I understand "..." as variable arguments. But what is "_x"?
> 
> Regards, \Janus



在 2012年2月26日星期日UTC+8上午12时02分47秒，janus写道：
> Hello All,
> 
> I would need some to explain the below code.
> #define RF_ARG16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) _15
> 
> I understand "..." as variable arguments. But what is "_x"?
> 
> Regards, \Janus

If the variaied  number of arguments in a function somewhat like printf called everywhere, then the stack has to be used a lot. 

I never call printf with more then 4 variables to show messages.

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.c

csiph-web