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