[MERGE] trees - add get_parent_ids

[Aaron Bentley]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Robert Collins wrote:
> On Fri, 2006-06-16 at 10:01 -0400, Aaron Bentley wrote:
> How about I change the api to be:
> [] for a tree known to have no parents including EmptyTree.
> [revid, ...] for trees descending from non-null parents.

Sounds good.

> raises BzrError *for now* if we do not know the parents. (When we have a
> use for it, we can and should create a specific exception. I'm just not
> sure what it should be called, and as we have no code that can generate
> this situation I'm hesitant about putting in an exception that may never
> ever be used/possible to use.

Sounds fine.

Aaron
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFEksPI0F+nu1YWqI0RAiiDAJ91VBbSKJCwjAXY/XnofXSEQEhtawCdHzo7
NWwsQPWUksen31Yxfp5oOu8=
=chYd
-----END PGP SIGNATURE-----