If Ty is a function, reference to function, pointer to function, or pointer to member function, result_type is a synonym for the return type of Ty If Ty is a class type with a member type named result_type, result_type is a synonym for Ty::result_type Otherwise, result_type is not...
Priority numbers do not have any absolute meaning — they are relevant only respective to other MX records for that domain name. The domain name given is the machine to which the mail is delivered. It must have an associated A record — CNAME is not sufficient. For a given domain, if ...