Re: [Boost-bugs] [Boost C++ Libraries] #4421: fix for #4400

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4421: fix for #4400
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-07-15 21:28:43

#4421: fix for #4400
  Reporter: Wolf Lammen <ookami1@…> | Owner: no-maintainer
      Type: Patches | Status: new
 Milestone: Boost 1.44.0 | Component: preprocessor
   Version: Boost 1.44.0 | Severity: Problem
Resolution: | Keywords:

Comment (by Wolf Lammen <ookami1@…>):

 The more I look into the preprocessor source code, the more I am
 convinced, Mr. Mensonides wanted his macros to be able to handle empty
 sequences. This is in contrast to how I read the preprocessor

 ''"Sequences are data structures that merge the properties of both lists
 and tuples with the exception that a seq cannot be empty. Therefore, an
 'empty' seq is considered a special case scenario that must be handled
 separately in C++."''

 If my assumption above is right, BOOST_PP_SEQ_REST_N works incorrect for
 256 as its first argument.

 So here is an alternative patch seq_split.patch, that fixes _both_
 BOOST_PP_SEQ_REST_N and BOOST_PP_SEQ_REPLACE, and, to boot, simplifies
 code in seq/rest_n.cpp and seq/first_n.cpp.

 IMHO, it should be preferred over my previous patch seq_replace.patch,
 that fixes BOOST_PP_SEQ_REPLACE only.

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