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Re: [PATCH 1/9] Define a structure for object IDs.

From
James Denholm <nod.helm@gmail.com>
Date
May 5, 2014, 09:33 UTC
Message-ID
<fd1b0343-d92f-4e51-a54e-a7629ea31028@email.android.com>
In-Reply-To
<87vbtk60lh.fsf@igel.home>
On 5 May 2014 19:23:06 GMT+10:00, Andreas Schwab <schwab@linux-m68k.org> wrote:
Show 9 quoted lines
>David Kastrup <dak@gnu.org> writes:
>
>> It does not as far as I can see guarantee that a pointer to something
>> of the same type of its first member can be converted to a pointer to
>> a struct even if the struct only contains a member of such type.
>
>This sentence doesn't make any sense.  If you have an object of struct
>type then any pointer to the first member of the object can only be a
>pointer to the one and same object.

I think what David means is that a pointer to a wrapper can be derefed into its internal, sure, but an object of that internal type can't necessarily pretend to be a wrapper.

That said, obviously I'm not David, so I could be wrong. That's what I got from his statement, though.

Regards, James Denholm.

Previous: Andreas SchwabNext: David Kastrup
Message 11 of 39 in “Use a structure for object IDs.”
  1. 0/9 Use a structure for object IDs.brian m. carlson, May 3, 2014
  2. 1/9 Define a structure for object IDs.brian m. carlson, May 3, 2014
  3. Michael HaggertyMay 4, 2014
  4. Johannes SixtMay 4, 2014
  5. David KastrupMay 4, 2014
  6. Andreas SchwabMay 4, 2014
  7. Johannes SixtMay 4, 2014
  8. Andreas SchwabMay 4, 2014
  9. David KastrupMay 5, 2014
  10. Andreas SchwabMay 5, 2014
  11. James DenholmMay 5, 2014
  12. David KastrupMay 5, 2014
  13. Michael HaggertyMay 5, 2014
  14. Andreas SchwabMay 5, 2014
  15. David KastrupMay 5, 2014
  16. Felipe ContrerasMay 5, 2014
  17. Duy NguyenMay 4, 2014
  18. brian m. carlsonMay 4, 2014
  19. Andreas SchwabMay 4, 2014
  20. David KastrupMay 4, 2014
  21. Andreas SchwabMay 4, 2014
  22. David KastrupMay 4, 2014
  23. Andreas SchwabMay 4, 2014
  24. 2/9 bisect.c: convert to use struct object_idbrian m. carlson, May 3, 2014
  25. 3/9 archive.c: convert to use struct object_idbrian m. carlson, May 3, 2014
  26. 4/9 zip: use GIT_OID_HEXSZ for trailersbrian m. carlson, May 3, 2014
  27. 5/9 branch.c: convert to use struct object_idbrian m. carlson, May 3, 2014
  28. 6/9 bulk-checkin.c: convert to use struct object_idbrian m. carlson, May 3, 2014
  29. 7/9 bundle.c: convert leaf functions to struct object_idbrian m. carlson, May 3, 2014
  30. Michael HaggertyMay 6, 2014
  31. 8/9 cache-tree: convert struct cache_tree to use object_idbrian m. carlson, May 3, 2014
  32. Michael HaggertyMay 6, 2014
  33. Michael HaggertyMay 6, 2014
  34. 9/9 diff: convert struct combine_diff_path to object_idbrian m. carlson, May 3, 2014
  35. Michael HaggertyMay 6, 2014
  36. brian m. carlsonMay 3, 2014
  37. Michael HaggertyMay 4, 2014
  38. Johannes SixtMay 4, 2014
  39. brian m. carlsonMay 4, 2014

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