Your code works for me. What version of boost and what compiler are you using?
I grabbed the most recent boost-trunk from SVN. Here is the output of my g++ -v. $ g++ -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-4ubuntu9' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i486 --with-tune=generic --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu9) Here is the compiler error : zip.cpp: In member function ‘int get0_::operator()(Arg) const’: zip.cpp:33: error: expected primary-expression before ‘)’ token In file included from /usr/include/c++/4.4/algorithm:62, from zip.cpp:3: /usr/include/c++/4.4/bits/stl_algo.h: In function ‘_Funct std::for_each(_IIter, _IIter, _Funct) [with _IIter = boost::zip_iterator<boost::tuples::tuple<__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >, _Funct = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >
]’: zip.cpp:51: instantiated from here /usr/include/c++/4.4/bits/stl_algo.h:4200: error: no match for call to ‘(boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >) (boost::tuples::cons<int&, boost::tuples::cons<int&, boost::tuples::null_type> >)’ /home/kvm/boost/boost-trunk/boost/spirit/home/phoenix/core/actor.hpp:90: note: candidates are: typename boost::mpl::eval_if<typename Eval::no_nullary, boost::mpl::identity<boost::phoenix::detail::error_expecting_arguments>, boost::phoenix::eval_result<Eval, boost::phoenix::basic_environment<boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > ::type boost::phoenix::actor<Eval>::operator()() const [with Eval = boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >] /home/kvm/boost/boost-trunk/boost/spirit/home/phoenix/core/actor.hpp:107: note: typename boost::phoenix::actor<Eval>::result<boost::phoenix::actor<Eval>(T0&)>::type boost::phoenix::actor<Eval>::operator()(T0&) const [with T0 = boost::tuples::cons<int&, boost::tuples::cons<int&, boost::tuples::null_type> >, Eval = boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >]
When I replace a1.get<0>() with boost::tuples::get<0>(a1) I get the following error : In file included from /usr/include/c++/4.4/algorithm:62, from zip.cpp:3: /usr/include/c++/4.4/bits/stl_algo.h: In function ‘_Funct std::for_each(_IIter, _IIter, _Funct) [with _IIter = boost::zip_iterator<boost::tuples::tuple<__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >, _Funct = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >
]’: zip.cpp:51: instantiated from here /usr/include/c++/4.4/bits/stl_algo.h:4200: error: no match for call to ‘(boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >) (boost::tuples::cons<int&, boost::tuples::cons<int&, boost::tuples::null_type> >)’ /home/kvm/boost/boost-trunk/boost/spirit/home/phoenix/core/actor.hpp:90: note: candidates are: typename boost::mpl::eval_if<typename Eval::no_nullary, boost::mpl::identity<boost::phoenix::detail::error_expecting_arguments>, boost::phoenix::eval_result<Eval, boost::phoenix::basic_environment<boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > ::type boost::phoenix::actor<Eval>::operator()() const [with Eval = boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >] /home/kvm/boost/boost-trunk/boost/spirit/home/phoenix/core/actor.hpp:107: note: typename boost::phoenix::actor<Eval>::result<boost::phoenix::actor<Eval>(T0&)>::type boost::phoenix::actor<Eval>::operator()(T0&) const [with T0 = boost::tuples::cons<int&, boost::tuples::cons<int&, boost::tuples::null_type> >, Eval = boost::phoenix::composite<boost::phoenix::shift_left_eval, boost::fusion::vector<boost::phoenix::reference<std::basic_ostream<char, std::char_traits<char> > >, boost::phoenix::composite<boost::phoenix::detail::function_eval<1>, boost::fusion::vector<boost::phoenix::value<get0_>, boost::phoenix::argument<0>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >]
In Christ, Steven Watanabe
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