On 9/15/07, Tobias Schwinger <tschwinger@isonews2.com> wrote:
In this case it's sufficient to replace the above code with
typedef std::string result_type;
&)>' boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp:41: instantiated from 'boost::fusion::detail::fold_apply<boost::fusion::vector_iterator<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, 0>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string>' boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp:202: instantiated from 'boost::fusion::detail::result_of_unrolled_fold<boost::fusion::vector_iterator<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, 0>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string, 2>' boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp:227: instantiated from 'boost::fusion::detail::choose_fold<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string, true>' boost_dir/boost/fusion/algorithm/iteration/fold.hpp:29: instantiated from 'boost::fusion::result_of::fold<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string>'
Sorry but still does not compile: bash-3.1$ g++ -Iboost_dir -o test main.cpp boost_dir/boost/utility/result_of.hpp: In instantiation of 'boost::detail::result_of_nested_result<make_string, make_string ()(const int&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)>': boost_dir/boost/utility/result_of.hpp:34: instantiated from 'boost::detail::result_of_impl<make_string, make_string ()(const int&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&), false>' boost_dir/boost/utility/result_of.hpp:27: instantiated from 'boost::result_of<make_string ()(const int&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> main2.cpp:27: instantiated from here boost_dir/boost/utility/result_of.hpp:68: error: wrong number of template arguments (1, should be 2) main2.cpp:12: error: provided for 'template<class T, class State> struct make_string::result' boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp: In instantiation of 'boost::fusion::detail::fold_apply<boost::fusion::vector_iterator<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, 0>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string>': boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp:202: instantiated from 'boost::fusion::detail::result_of_unrolled_fold<boost::fusion::vector_iterator<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, 0>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string, 2>' boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp:227: instantiated from 'boost::fusion::detail::choose_fold<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string, true>' boost_dir/boost/fusion/algorithm/iteration/fold.hpp:29: instantiated from 'boost::fusion::result_of::fold<const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, make_string>' main2.cpp:27: instantiated from here boost_dir/boost/fusion/algorithm/iteration/detail/fold.hpp:41: error: no type named 'type' in 'struct boost::result_of<make_string ()(const int&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)>' main2.cpp: In function 'int main(int, char**)': main2.cpp:27: error: no matching function for call to 'fold(const boost::fusion::vector<int, int, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_>&, std::string, make_string)' bash-3.1$ The test now is: struct make_string { template<typename T, typename State> struct result { typedef std::string result_type; }; template<typename T> std::string operator()(const T& t, const std::string& str) const { return str + boost::lexical_cast<std::string>(t); } }; int main(int argc, char* argv[]) { const vector<int,int> vec(1,2); assert(fold(vec,std::string(""), make_string()) == "12"); return 0; }