The code in the 1st attachment fails to compile as shown in 2nd attachment. If that's intended, the what's the justification for not allowing appending to an empty sequence? If that's not intended, then should I file a bug report? Based on: <fusion.doc>/html/fusion/algorithm/transformation/functions/push_back.html it seems push_back should work on a 'Forward Sequence' and based on: <fusion.doc>/html/fusion/container/list.html list is a 'Forward Sequence'. And based on the following quote from the Synopsis of the list.html:
The variadic class interface accepts 0 to FUSION_MAX_LIST_SIZE elements
an empty list type, i.e. list<>, is a list, the attached code should compile. -regards Larry ###-*- mode: compilation; default-directory: "~/prog_dev/boost-svn/ro/trunk/libs/fusion/sandbox/" -*- Compilation started at Fri Jul 16 02:08:38 make HOW=gcc4_5n run install -d `dirname /home/evansl/prog_dev/boost-svn/ro/trunk/sandbox-local/build/gcc4_5n/boost-svn/ro/trunk/libs/fusion/sandbox/list_push_back.o` /home/evansl/download/gcc/4.5-20100624/install/bin/g++ -c -Wall -ftemplate-depth-300 -O0 -g3 -fno-inline -std=gnu++0x -I/home/evansl/prog_dev/boost-svn/ro/trunk -DTEMPLATE_DEPTH=300 list_push_back.cpp -MMD -o /home/evansl/prog_dev/boost-svn/ro/trunk/sandbox-local/build/gcc4_5n/boost-svn/ro/trunk/libs/fusion/sandbox/list_push_back.o list_push_back.cpp: In function 'void boost::fusion::sandbox::run()': list_push_back.cpp:25:45: error: no matching function for call to 'boost::fusion::joint_view<boost::fusion::list<>, const boost::fusion::single_view<int> >::joint_view(boost::fusion::result_of::push_back<const boost::fusion::list<>, int>::type)' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/fusion/view/joint_view/joint_view.hpp:55:9: note: candidates are: boost::fusion::joint_view<Sequence1, Sequence2>::joint_view(Sequence1&, Sequence2&) [with Sequence1 = boost::fusion::list<>, Sequence2 = const boost::fusion::single_view<int>] /home/evansl/prog_dev/boost-svn/ro/trunk/boost/fusion/view/joint_view/joint_view.hpp:34:5: note: boost::fusion::joint_view<boost::fusion::list<>, const boost::fusion::single_view<int> >::joint_view(const boost::fusion::joint_view<boost::fusion::list<>, const boost::fusion::single_view<int> >&) make: *** [/home/evansl/prog_dev/boost-svn/ro/trunk/sandbox-local/build/gcc4_5n/boost-svn/ro/trunk/libs/fusion/sandbox/list_push_back.o] Error 1 Compilation exited abnormally with code 2 at Fri Jul 16 02:08:40