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Date: Thu, 21 Aug 2008 13:43:00 -0000
From: Richard Harvey Chapman <hchapman-gcc-help@3gfp.com>
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To: gcc <gcc-help@gcc.gnu.org>
Subject: Re: Macro question regarding single quotes
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Perfect! And so simple.

Thanks,

H.

Bernd Jendrissek wrote:
> On Fri, Aug 15, 2008 at 10:38 PM, Richard Harvey Chapman
> <hchapman-gcc-help@3gfp.com> wrote:
>> I'd like to shorten-up so redundant code in a switch statement by using a
>> macro for each case. The following code illustrates the problem. In short,
>> is there a way to write the PARSE(a,b) macro that will work in the manner
>> shown below?
> 
> How about something like this:
> 
> #define rhc__A 'A'
> #define rhc__B 'B'
> #define rhc__C 'C'
> #define rhc__D 'D'
> #define rhc__E 'E'
> #define rhc__F 'F'
> // etc.
> 
> // * not allowed in case statement
> #define PARSE(a,b)   case (rhc__##a << 8) | rhc__##b: \
>                      status = Parse##a##b();     \
>                      break
> 
> This depends on a reasonable-sized alphabet, of course!