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Has the form:
l[f]
          where f is a function with
          the signatures:
        
void f(); void f(Iterator&, Iterator&); void f(Iterator&, Iterator&, pass_flag&); void f(Iterator&, Iterator&, pass_flag&, Idtype&); void f(Iterator&, Iterator&, pass_flag&, Idtype&, Context&);
You can use Boost.Bind to bind member functions. For function objects, the allowed signatures are:
void operator()(unused_type, unused_type, unused_type, unused_type, unused_type) const; void operator()(Iterator&, Iterator&, unused_type, unused_type, unused_type) const; void operator()(Iterator&, Iterator&, pass_flag&, unused_type, unused_type) const; void operator()(Iterator&, Iterator&, pass_flag&, Idtype&, unused_type) const; void operator()(Iterator&, Iterator&, pass_flag&, Idtype&, Context&) const;
          The unused_type is used
          in the signatures above to signify 'don't care'.
        
For more information see Lexer Semantic Actions.