Hello! I'd like to parse one-line statements from an ascii file using boost spirit into structs. Statements may be quite different and may occur in arbitrary order. I'm wondering how I can achieve something like the following: /qi::rule<T, Statement(), Skipper> r_statement; qi::rule<T, DerivedStatement0(), Skipper> r_derivedStatement0; qi::rule<T, DerivedStatement1(), Skipper> r_derivedStatement1;/ With: /struct Statement { // empty }; struct DerivedStatement0 : public Statement { // members }; struct DerivedStatement1 : public Statement { // members };/ First thing I'm not sure about is how to adapt (using /BOOST_FUSION_ADAPT_STRUCT/) this hierarchy, since /Statement/ has no members. I've seen some snippets on the internet where inherited members (data members are good for me, no member functions) were adapted using /BOOST_FUSION_ADAPT_STRUCT/, so I'm right to believe that inheritance in my case shell pose no problem? Well, I'm actually not sure if the idea I came up with is the right way to accomplish this in the first place, so I'm grateful for any suggestions on how to do this more appropriately. Thanks in advance! Cheers, Stefan -- Stefan Zellmann Dipl.-Wirt.-Inf. Universität zu Köln RRZK Phone: +49 221 478 86578 Mail: zellmans@uni-koeln.de