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boost::proto::result_of::as_expr — A metafunction that computes the return type of the
            proto::as_expr() function.
// In header: <boost/proto/traits.hpp> template<typename T, typename Domain = proto::default_domain> struct as_expr { // types typedef typename Domain::template as_expr< T >::result_type type; };
              The proto::result_of::as_expr<> metafunction turns types
              into Proto expression types, if they are not already, in a domain-specific way. It is intended
              for use to compute the type of a local variable that can hold the result of the
              proto::as_expr() function.
            
              See proto::domain::as_expr<>
              for a complete description of the default behavior.