Re: [boost] Re: ATTN: All Developers Interested in Boost.Preprocessor

From: Rene Rivera (grafik666_at_[hidden])
Date: 2003-04-30 20:57:57

[2003-04-30] Paul Mensonides wrote:

>David Abrahams wrote:
>> ** and which I'm not sure is even addressing a real-world problem.  It
>>    might be; I am just not sure.
>
>It is not something that can't be worked around, but it is a nuisance.
>Basically, you have to expand a macro to produce a comma--but do it only at
the
>last possible step so it doesn't go through any other macros.  The problem
is
>not that so much.  Rather, it implies that you have to pass everything else
as
>such an "invocable" entity--which is annoying at best.

If that's the case would not a more general utility to insert/escape
literals be desirable.

Perhaps adding an #escape or #literal command to the preprocessor which only
replaces the argument as the last stage after all other replacements?

And to rephrase Vesa's example...

#define ID(x) x
ID( #escape "("                             )
ID(             a #escape "," b             )
ID(                             #escape ")" )

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