[Boost-bugs] [Boost C++ Libraries] #6760: PUSH_BACK/_FRONT on empty array broken

Subject: [Boost-bugs] [Boost C++ Libraries] #6760: PUSH_BACK/_FRONT on empty array broken
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-04-03 15:15:32

#6760: PUSH_BACK/_FRONT on empty array broken
-----------------------------------+----------------------------------------
 Reporter:  yves.pausch@…          |       Owner:  no-maintainer
     Type:  Bugs                   |      Status:  new          
Milestone:  Boost 1.50.0           |   Component:  preprocessor 
  Version:  Boost 1.49.0           |    Severity:  Problem      
 Keywords:                         |  
-----------------------------------+----------------------------------------
 BOOST_PP_ARRAY_PUSH_BACK & BOOST_PP_ARRAY_PUSH_FRONT on empty array leads
 to invalid C++ because of unresolved macro

 Sample to reproduce this bug:

 #define ARRAY (3, (a, b, c))
 #define EMPTY_ARRAY (0, ())
 BOOST_PP_ARRAY_PUSH_BACK(ARRAY, d)
 BOOST_PP_ARRAY_PUSH_BACK(EMPTY_ARRAY, d)

 brings '''using 1.48'''

 (4, (a, b, c , d))
 (1, ( d))

 which is expected and correct

 brings '''using 1.49'''

 (4, (a, b, c , d))
 (1, (BOOST_PP_TUPLE_REM_0 () d))

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6760>
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