[Boost-users] [multiindex] combination with boost::tuple

Hi! I'd like to use boost::tuple in a list-replacing multiindex and use the first entry in the tuple as key. The following fails to compile. Could you please provide a correction? #include #include #include #include namespace bm = ::boost::multi_index; class C { typedef boost::tuple data_t; template <typename T> struct mutable_value { mutable_value(const T& t):t(t){} operator T&()const{return t;} private: mutable T t; }; typedef bm::multi_index_container , bm::indexed_by , bm::ordered_unique > > > > storage_t; storage_t storage_; }; int main() { C c; }