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boost::proto::result_of::make_expr — Metafunction that computes the return type of the
            proto::make_expr()
            function, with a domain deduced from the domains of the children.
// In header: <boost/proto/make_expr.hpp>
template<typename Tag, typename... A> 
struct make_expr {
  // types
  typedef domain-deduced-from-child-types                          D;   
  typedef typename proto::result_of::make_expr<Tag, D, A...>::type type;
};
              Computes the return type of the
              proto::make_expr() function.
            
              In this specialization, the domain is deduced from the domains of the child types.
              If proto::is_domain<A0>::value
              is true, then another specialization is selected.
            
make_expr 
        public
       types
typedef domain-deduced-from-child-types D;
                In this specialization, Proto uses the domains of the child expressions to compute the
                domain of the parent. See
                proto::deduce_domain for a full
                description of the procedure used.