id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
8606,Impossible to convert 0-size tuple to (empty) sequence any more,vz-boost@…,No-Maintainer,"The following used to work just fine with 1.48:
{{{
#!cpp
#include <boost/preprocessor.hpp>

BOOST_PP_TUPLE_TO_SEQ(0, ())
}}}
producing
{{{
()
}}}
on output. With 1.53 (and probably later as there haven't been any changes since then AFAICS) it now also generates the following warnings when using MSVC (tested with 2008 and 2010):
{{{
warning C4003: not enough actual parameters for macro 'BOOST_PP_TUPLE_TO_SEQ_1'
}}}
but somehow still generates correct output. With g++ 4.4 it's even worse and it expands into
{{{
BOOST_PP_TUPLE_TO_SEQ_0 ()
}}}
resulting in compilation errors.

This seems to be the result of [https://github.com/ryppl/boost-svn/commit/fd3633b27d0ef637f6cffc3239c981a4876172a6#boost/preprocessor/tuple/to_seq.hpp changes done while adding variadic support] to the preprocessor library as `BOOST_PP_TUPLE_TO_SEQ_0()` definition was removed in this commit.

Notice that [http://www.boost.org/doc/libs/1_53_0/libs/preprocessor/doc/ref/tuple_to_seq.html the documentation] does say that tuple size must be `>= 1` but this was changed in 1.49, compare the version above with [http://www.boost.org/doc/libs/1_48_0/libs/preprocessor/doc/ref/tuple_to_seq.html this one].

Finally notice I decided to open a new ticket for this even though this is already mentioned in a comment in #6616 because the other ticket doesn't to be about the same thing at all, so I thought it would be confusing to continue discussing this issue there. Please feel free to close this one if you think it's really the same issue.",Bugs,closed,To Be Determined,preprocessor,Boost 1.53.0,Regression,fixed,,