From: Nikolai Weibull <ruby-talk@...>
Date: 2003-12-30T08:44:42+09:00
Subject: Re: Question about Ruby implementation

* Jamis Buck <jgb3@email.byu.edu> [Dec, 30 2003 00:29]:
> >It's good style in general. Consider
> Yah, I understand that, I think.  But why have MACRO wrap its contents
> in a "do{...}while(0)", instead of just "{...}"?  In other words, is
> there a compelling reason to do this:
>
>  #define MACRO(x) \
>      do { \
>        x \
>      } while(0)
>
> instead of this:
>
>  #define MACRO(x) \
>       { \
>           x \
>       }
>
no one prefers this - some compilers actually generate code for the
do-while (which is incredible...), the reason is that braces used in the
second way isn't standard in C89 (if i'm not mistaken) or at least not
supported by all compilers.  A way would be to use another macro that
would encapsulate this stuff, as GLib does provide.
	nikolai

--
::: name: Nikolai Weibull    :: aliases: pcp / lone-star / aka :::
::: born: Chicago, IL USA    :: loc atm: Gothenburg, Sweden    :::
::: page: www.pcppopper.org  :: fun atm: gf,lps,ruby,lisp,war3 :::
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