Nesting Grammars with boost::spirit

From: Dan Nuffer (nuffer_at_[hidden])
Date: 2003-05-26 19:56:07

I have two grammars defined (value and variable).  I'll paste value here, variable is very similar:

struct value : public grammar<value>
{
        template <typename ScannerT>
        struct definition
        {
                definition(value const &self)
                {
                        val = real_p[&do_real] | ('-' >> val)[&do_neg] | '+' >> val;
                }
                
                rule<ScannerT> val;
                rule<ScannerT> const &start() const
                {
                        return val;
                }
        };
};

Now I want to define a grammar that uses both of these, for instance part of it might be (value | variable)... how can I do this?  Thanks.

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