Re: On alignment

[Gabriel Dos Reis <gdr at integrable-solutions dot net>]

Tom Tromey <tromey at redhat dot com> writes:

[...]

| Gabriel> I think the template-based solution I posted in another
| Gabriel> message solves the problem...
| 
| In that message you said that you got "8" as the answer for a double
| field on x86.  That's not the answer I'm looking for :-(.  On x86, a
| double field has alignment 4, while a non-field double has alignment
| 8. 

Thank you for correcting me; it seems like I made two errors in my
previous post:

  1) I took the __alignof__ of the field instead of the instance
  2) I used a reference (I can't remember why I wrote that).

They are corrected now in this:

    template<typename T>
      struct object_alignment {

         struct helper {
            T datum;
            helper();
         };

         static helper instance;

         enum { value = __alignof__ (instance) };
      };

and now, I get the expected answer (4).  [I would appreciate you
double check]

Thanks,

-- Gaby