Hi all,

I would like to customize the example calc4.cpp at http://www.boost.org/doc/libs/1_47_0/libs/spirit/example/qi/compiler_tutorial/calc4.cpp to the following grammar:

G-------> { A+; C}

A--------> {B; C}

B--------->E (like arithmetic expression grammar in calc4.cpp)

How to modifier this boost variant instruction for this grammar or there no need to change it:

 typedef boost::variant<
            nil
          , unsigned int
          , boost::recursive_wrapper<signed_>
          , boost::recursive_wrapper<program>
        >

In general what to put in boost variant for specific grammar (or AST). Any suggestion is welcome. Thank you.

Regards
Olivier