Bug 15092 - Can't subclass a class which is using the group mixin
Summary: Can't subclass a class which is using the group mixin
Status: RESOLVED FIXED
Alias: None
Product: Telepathy
Classification: Unclassified
Component: tp-glib (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Telepathy bugs list
QA Contact: Telepathy bugs list
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Reported: 2008-03-17 06:47 UTC by Guillaume Desmottes
Modified: 2009-01-12 04:47 UTC (History)
0 users

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Description Guillaume Desmottes 2008-03-17 06:47:42 UTC 
If you try to create a class FooMucChannel as a subclass of MucChannel, you'll have this crash when trying to use the group mixin:

** CRITICAL **: tp_mixin_offset_cast: assertion `offset != 0' failed

#4  0xb7cdcf89 in g_log () from /usr/lib/libglib-2.0.so.0
#5  0xb7cdd06b in g_return_if_fail_warning () from /usr/lib/libglib-2.0.so.0
#6  0xb7c90152 in tp_mixin_offset_cast (instance=0x80cb9d0, offset=0) at util.c:158
#7  0xb7c8647d in tp_group_mixin_add_members (obj=0x80ce808, contacts=0x80abc80, message=0x809eb39 "", error=0x0) at group-mixin.c:451
#8  0x08064632 in salut_muc_channel_invited (self=0x80ce808, inviter=1, stanza=0x0, error=0x0) at salut-muc-channel.c:854


As an ugly workaround, you can recall tp_group_mixin_class_init, tp_group_mixin_init (using the MucChannel offset) and tp_group_mixin_change_flags in FooMucChannel's code.
Comment 1 Simon McVittie 2009-01-12 04:47:02 UTC 
Fixed in 0.7.19.

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