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_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