davlet_panech@my-deja.com (Davlet Panech) wrote in message news:<86b42096.0109181203.65c44d6e@posting.google.com>...
> Hi,
>
> Is the following code legal?
>
> #define LPAREN (
> #define RPAREN )
> #define A(x) x
> A LPAREN int y RPAREN ;
>
> In other words, does the last line invoke macro A?
>
> Thanks,
> D.P.
>
> ---

I do not think so. The last line will be:
A ( int y ) ;
There is a space between 'A' and '(', so it will not be treated as a MACRO A().

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tinct@163.com (Tinct) wrote in message news:<5450facb.0109191814.5aea776f@posting.google.com>...
> davlet_panech@my-deja.com (Davlet Panech) wrote in message news:<86b42096.0109181203.65c44d6e@posting.google.com>...
> > Hi,
> >
> > Is the following code legal?
> >
> > #define LPAREN (
> > #define RPAREN )
> > #define A(x) x
> > A LPAREN int y RPAREN ;
> >
> > In other words, does the last line invoke macro A?
> >
> > Thanks,
> > D.P.
> >
> > ---
>
> I do not think so. The last line will be:
> A ( int y ) ;
> There is a space between 'A' and '(', so it will not be treated as a MACRO A().

No, whitespace is significant only in macro definitions:

#define A(x) // one parameter
#define A (x) // no parameters

but not in macro invocations. My question is whether or not macros
LPAREN & RPAREN will be expanded before A is expanded. I think not,
but I just wanted to confirm that.

D.P.

>
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Davlet Panech wrote:
[SNIP]
> but not in macro invocations. My question is whether or not macros
> LPAREN & RPAREN will be expanded before A is expanded. I think not,
> but I just wanted to confirm that.

Not with SUN and I guess the way it works is sequential, so A will stay
A then you get ( and so on.  I have tested by printing out the
preprocessed code.
Attila

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Hi,

Is the following code legal?

#define LPAREN (
#define RPAREN )
#define A(x) x
A LPAREN int y RPAREN ;

In other words, does the last line invoke macro A?

Thanks,
D.P.

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