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Has the form:
p[f]
          where f is a function with
          the signatures:
        
void f(Attrib const&); void f(Attrib const&, Context&); void f(Attrib const&, Context&, bool&);
You can use Boost.Bind to bind member functions. For function objects, the allowed signatures are:
void operator()(Attrib const&, unused_type, unused_type) const; void operator()(Attrib const&, Context&, unused_type) const; void operator()(Attrib const&, Context&, bool&) const;
          The unused_type is used
          in the signatures above to signify 'don't care'.
        
For more detailed information about semantic actions see: here.