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Semantic Actions may be attached to any generator as follows:
g[f]
          where f is a function with
          the signatures:
        
void f(Attrib&); void f(Attrib&, Context&); void f(Attrib&, Context&, bool&);
You can use Boost.Bind to bind member functions. For function objects, the allowed signatures are:
void operator()(Attrib&, unused_type, unused_type) const; void operator()(Attrib&, Context&, unused_type) const; void operator()(Attrib&, Context&, bool&) const;
          The unused_type is used
          in the signatures above to signify 'don't care'.
        
For more information see Semantic Actions.