id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
3326,struct tagging in constructor stops conditional construction without .swap call,Andy Schneider <andrew.schneider@…>,Ion Gaztañaga,"I'd like to do this: 

   shared_memory_object shm_obj
      (isOwner  ? create_only  : open_only
      ,""shared_memory""              //name
      ,read_write                    //read-write mode
      );

but I don't seem to be able to because create_only and open_only are tag structs. 

Instead I end up with something like this:

shared_memory_object shm;

if (isOwner)
{
    shared_memory_object shm_obj (...)
    shm_obj.swap (shm);
}
else
{
    shared_memory_object shm_obj (...)
    shm_obj.swap (shm);
}

which isn't as clean imho. What's the rational for a tag struct rather than enum? 
",Bugs,closed,Boost 1.40.0,interprocess,Boost 1.39.0,Cosmetic,wontfix,,