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Think about a more introspectable way of doing mixins

Submitted by Xavier Claessens @xclaesse

Assigned to Telepathy bugs list

Link to original bug (#59024)

Description

In bug #14540 we decided to use a new way of doing TpNamesMixin:

Some rules for TpFooMixin:

  1. Virtual methods are in a proper GInterface TpFooInterface
  2. No public TpFooMixin struct, all data are kept internal
  3. functions takes the base class (e.g. TpBaseConnection) as first arg
  4. tp_foo_mixin_init() only takes one arg (the base object) and store its internal mixin struct using g_object_set_qdata_full().
  5. no tp_foo_mixin_finalize() needed.

Blocking