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BOOST_PROTO_MAX_FUNCTION_CALL_ARITY — Controls the maximum number of arguments that operator() overloads
      accept.
// In header: <boost/proto/proto_fwd.hpp>
BOOST_PROTO_MAX_FUNCTION_CALL_ARITY
        When setting
        
          BOOST_PROTO_MAX_ARITY
         higher than the default, compile times
        slow down considerably. That is due in large part to the explosion in the number of
        operator() overloads that must be generated for each
        Proto expression type. By setting BOOST_PROTO_MAX_FUNCTION_CALL_ARITY
        lower than BOOST_PROTO_MAX_ARITY,
        compile times can be sped up considerably.