Re: [boost] [C++0x] Emulation of scoped enums

Subject: Re: [boost] [C++0x] Emulation of scoped enums
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-06-05 11:06:19

AMDG

David Abrahams wrote:
> on Thu Mar 05 2009, Matt Calabrese <rivorus-AT-gmail.com> wrote:
>
>   
>> The problem with using a PP sequence is that you are going to hit a
>> hard limit of 256 elements
>>     
>
> Hm, I was under the impression that PP SEQs weren't limited in that
> way.  Am I missing something?
>   

Nearly everything in the PP library has a hard limit of 256.
for instance, I see code like this for PP SEQs:

# define BOOST_PP_SEQ_ELEM_0(x) x, BOOST_PP_NIL
# define BOOST_PP_SEQ_ELEM_1(_) BOOST_PP_SEQ_ELEM_0
# define BOOST_PP_SEQ_ELEM_2(_) BOOST_PP_SEQ_ELEM_1
...
# define BOOST_PP_SEQ_ELEM_255(_) BOOST_PP_SEQ_ELEM_254

True, it's possible to create larger SEQs, but the PP library
can't process them.

In Christ,
Steven Watanabe