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boost::proto::functional::make_expr — A PolymorphicFunctionObject equivalent to the 
            proto::make_expr() function.
// In header: <boost/proto/make_expr.hpp> template<typename Tag, typename Domain = proto::deduce_domain> struct make_expr : proto::callable { // member classes/structs/unions template<typename This, typename... A> struct result<This(A...)> : proto::result_of::make_expr< Tag, Domain, A... > { }; // public member functions template<typename... A> typename proto::result_of::make_expr< Tag, Domain, A const... >::type const operator()(A const &...) const; };
              In all cases, proto::functional::make_expr<Tag, Domain>()(a...)
              is equivalent to proto::make_expr<Tag, Domain>(a...).
            
              proto::functional::make_expr<Tag>()(a...) is equivalent to
              proto::make_expr<Tag>(a...).
            
make_expr public member functionstemplate<typename... A> typename proto::result_of::make_expr< Tag, Domain, A const... >::type const operator()(A const &... a) const;
                  Construct an expression node with tag type Tag and in the 
                  domain Domain.
                
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