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      The Actor is the main concept
      behind the library. Actors are function objects. An actor can accept 0 to
      BOOST_PHOENIX_LIMIT arguments.
    
| ![[Note]](../../../../../doc/src/images/note.png) | Note | 
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        You can set  | 
      Phoenix supplies an actor class
      template whose specializations model the Actor
      concept. actor has one template
      parameter, Expr, that supplies
      the underlying expression to evaluate.
    
template <typename Expr> struct actor { return_type operator()() const; template <typename T0> return_type operator()(T0& _0) const; template <typename T0, typename T1> return_type operator()(T0& _0, T1& _1) const; //... };
      The actor class accepts the arguments through a set of function call operators
      for 0 to BOOST_PHOENIX_LIMIT
      arities (Don't worry about the details, for now. Note, for example, that we
      skimp over the details regarding return_type).
      The arguments are passed through to the evaluation mechanism. For more information
      see Inside Actors.